The war on terror, officially the Global War on Terrorism (GWOT), is a global military campaign initiated by the United States in response to the September 11 attacks in 2001. A global conflict spanning multiple wars, some researchers and political scientists have argued that it replaced the Cold War. The main targets of the campaign were militant Islamist movements such as al-Qaeda, the Taliban, and their allies. Other major targets included the Ba'athist regime in Iraq, which was deposed in an invasion in 2003, and various militant factions that fought during the ensuing insurgency. Following its territorial expansion in 2014, the Islamic State also emerged as a key adversary of the United States. In 2026, the United States and Israel launched a war on Iran, identifying it as the largest state sponsor of terrorism. Al-Qaeda's de facto leader, Saif al-Adel, is believed to be living in Iran. The term "war on terror" uses war as a metaphor to describe a variety of actions which fall outside the traditional definition of war. US president George W. Bush first used the term "war on terrorism" on 16 September 2001, and then "war on terror" a few days later in a formal speech to Congress. Bush indicated the enemy of the war on terror as "a radical network of terrorists and every government that supports them". The initial conflict was aimed at al-Qaeda, with the main theater in Afghanistan and Pakistan, a region that would later be referred to as "AfPak". The term "war on terror" was immediately criticized by individuals including Richard Myers, then chairman of the Joint Chiefs of Staff, and eventually more nuanced terms came to be used by the Bush administration to define the campaign. While "war on terror" was never used as a formal designation of US operations, a Global War on Terrorism Service Medal was and is issued by the US Armed Forces. According to the Costs of War Project, the post-9/11 wars of the campaign have displaced 38 million people, the second largest number of forced displacements of any conflict since 1900, and caused more than 4.5 million deaths (direct and indirect) in Afghanistan, Iraq, Libya, Pakistan, Somalia, Syria and Yemen. They also estimate that it has cost the US Treasury over $8 trillion. While support for the "war on terror" was high among the American public during its initial years, it had become deeply unpopular by the late 2000s. Controversy over the war has focused on its morality, casualties, and continuity, with critics questioning government measures that infringed civil liberties and human rights. Critics have notably described the Patriot Act as "Orwellian" due to its substantial expansion of the federal government's surveillance powers. Controversial practices of coalition forces have been condemned, including drone warfare, surveillance, torture, extraordinary rendition, and various war crimes. The participating governments have been criticized for implementing authoritarian measures, repressing minorities, fomenting Islamophobia globally, and causing negative impacts to health and environment. Security analysts assert that there is no military solution to the conflict, pointing out that terrorism is not an identifiable enemy, and have emphasized the importance of negotiations and political solutions to resolve the underlying roots of the crises. Starting in 2025, Operation Southern Spear emerged as an extension of the war on terror adapted to combat narcoterrorism in Latin America, with the US government utilizing the same legal frameworks established in 2001 to justify the use of lethal force. Some analysts have identified this new approach as a hybridization of the war on terror and the war on drugs.
== Etymology == The phrase war on terror was used to refer specifically to the military campaign led by the United States, the United Kingdom, and allied countries against organizations and regimes identified by them as terrorist, and usually excludes other independent counter-terrorist operations and campaigns such as those by Russia and India. The conflict has also been referred to by other names, such as "World War III", "World War IV" (assuming the Cold War was World War III), "Bush's War on Terror", "The Long War", "The Forever War", "The Global War on Terror", "The War Against al-Qaeda", or "The War of Terror".
Use of phrase and its development
The phrase "war against terrorism" existed in North American popular culture and US political parlance before the war on terror. But it was not until the 11 September attacks that it emerged as a globally recognizable phrase and part of everyday lexicon. Tom Brokaw, having just witnessed the collapse of one of the towers of the World Trade Center, declared "Terrorists have declared war on [America]." On 16 September 2001, at Camp David, US president George W. Bush used the phrase war on terrorism in an ostensibly unscripted comment when answering a journalist's question about the impact of enhanced law enforcement authority given to the U.S. surveillance agencies on Americans' civil liberties: "This is a new kind of—a new kind of evil. And we understand. And the American people are beginning to understand. This crusade, this war on terrorism is going to take a while. And the American people must be patient. I'm going to be patient." The reference to Crusades became subject to heavy criticism due to its controversial connotations in the Muslim world and historical Muslim-Christian relations. On 20 September 2001, during a televised address to a joint session of Congress, George Bush said, "Our war on terror begins with al Qaeda, but it does not end there. It will not end until every terrorist group of global reach has been found, stopped and defeated." Both the term and the policies it denotes have been a source of ongoing controversy, as various critics and organizations like Amnesty International have argued that it has been used to justify unilateral preventive war, human rights abuses and other violations of international law. The political theorist Richard Jackson has argued that "the 'war on terrorism' [...] is simultaneously a set of actual practices—wars, covert operations, agencies, and institutions—and an accompanying series of assumptions, beliefs, justifications, and narratives—it is an entire language or discourse". Jackson cites, among many examples, a statement by John Ashcroft that "the attacks of September 11 drew a bright line of demarcation between the civil and the savage".
Administration officials also described "terrorists" as hateful, treacherous, barbarous, mad, twisted, perverted, without faith, parasitical, inhuman, and, most commonly, evil. Americans, in contrast, were described as brave, loving, generous, strong, resourceful, heroic, and respectful of human rights. Denouncing the remarks of George W. Bush, Osama Bin Laden stated during an interview on 21 October 2001: "The events proved the extent of terrorism that America exercises in the world. Bush stated that the world has to be divided in two: Bush and his supporters, and any country that doesn't get into the global crusade is with the terrorists. What terrorism is clearer than this? Many governments were forced to support this "new terrorism."
=== Decline of the phrase's usage by the US government === In April 2007, the British government announced publicly that it was abandoning the phrase "war on terror" because it found it less than helpful. This was explained later by Lady Eliza Manningham-Buller. In her 2011 Reith lecture, the former head of MI5 said that the 9/11 attacks were "a crime, not an act of war. So I never felt it helpful to refer to a war on terror."
US president Barack Obama rarely used the term, but in his inaugural address on 20 January 2009, he stated: "Our nation is at war, against a far-reaching network of violence and hatred." In March 2009 the Defense Department officially changed the name of operations from "Global War on Terror" to "Overseas Contingency Operation" (OCO). In March 2009, the Obama administration requested that Pentagon staff members avoid the use of the term and instead to use "Overseas Contingency Operation". Basic objectives of the Bush administration "war on terror", such as targeting al Qaeda and building international counterterrorism alliances, remained in place.
==== Abandonment of phrase ==== In May 2010, the Obama administration published a report outlining its National Security Strategy. The document dropped the Bush-era phrase "global war on terror" and reference to "Islamic extremism," and stated, "This is not a global war against a tactic—terrorism, or a religion—Islam. We are at war with a specific network, al-Qaeda, and its terrorist affiliates who support efforts to attack the United States, our allies, and partners." Usage of the term "war on terror" was initially discontinued in May 2010 and again in May 2013. On 23 May 2013, US president Barack Obama announced that the "war on terrorism" was over, saying that the US would not wage war against a tactic but would instead focus on a specific group of terrorist networks. Other American military campaigns during the 2010s have also been considered part of the "war on terror" by individuals and the media. The rise of the Islamic State in Iraq and Syria during 2014–2015 led to the global Operation Inherent Resolve, and an international campaign to destroy the terrorist organization. This was considered to be another campaign of the "war on terror". In December 2012, Jeh Johnson, the General Counsel of the Department of Defense, speaking at Oxford University, stated that the war against al-Qaeda would end when the terrorist group had been weakened so that it was no longer capable of "strategic attacks" and had been "effectively destroyed." At that point, the war would no longer be an armed conflict under international law, and the military fight could be replaced by a law enforcement operation. In May 2013, two years after the killing of Osama bin Laden, Barack Obama delivered a speech that employed the term global war on terror put in quotation marks (as officially transcribed by the White House): "Now, make no mistake, terrorists still threaten our nation. ... In Afghanistan, we will complete our transition to Afghan responsibility for that country's security. ... Beyond Afghanistan, we must define our effort not as a boundless 'global war on terror,' but rather as a series of persistent, targeted efforts to dismantle specific networks of violent extremists that threaten America. In many cases, this will involve partnerships with other countries." Nevertheless, in the same speech, in a bid to emphasize the legality of military actions undertaken by the US, noting that Congress had authorised the use of force, he went on to say, "Under domestic law, and international law, the United States is at war with al Qaeda, the Taliban, and their associated forces. We are at war with an organization that right now would kill as many Americans as they could if we did not stop them first. So this is a just war—a war waged proportionally, in last resort, and in self-defense." Nonetheless, the use of the phrase "war on terror" persists in US politics. In 2017, for example, US vice president Mike Pence called the 1983 Beirut barracks bombing "the opening salvo in a war that we have waged ever since—the global war on terror."
Background
Precursor to 11 September attacks
In May 1996, the group World Islamic Front for Jihad Against Jews and Crusaders (WIFJAJC), sponsored by Osama bin Laden (and later re-formed as al-Qaeda), started forming a large base of operations in Afghanistan, where the Islamist extremist regime of the Taliban had seized power earlier in the year. In August 1996, Bin Laden declared jihad against the United States. In February 1998, Osama bin Laden signed a fatwa, as head of al-Qaeda, declaring war on the West and Israel; in May al-Qaeda released a video declaring war on the US and the West. On 7 August 1998, al-Qaeda struck the U.S. embassies in Kenya and Tanzania, killing 224 people, including 12 Americans. In retaliation, US president Bill Clinton launched Operation Infinite Reach, a bombing campaign in Sudan and Afghanistan against targets the US asserted were associated with WIFJAJC, although others have questioned whether a pharmaceutical plant in Sudan was used as a chemical warfare facility. The plant produced much of the region's antimalarial drugs and around 50% of Sudan's pharmaceutical needs. The strikes failed to kill any leaders of WIFJAJC or the Taliban. Next came the 2000 millennium attack plots, which included an attempted bombing of Los Angeles International Airport. On 12 October 2000, the USS Cole bombing occurred near the port of Yemen, and 17 US Navy sailors were killed.
11 September attacks
On the morning of 11 September 2001, nineteen men hijacked four jet airliners, all of them bound for California. Once the hijackers assumed control of the jet airliners, they told the passengers that they had a bomb on board and would spare the lives of passengers and crew once their demands were met—no passenger and crew actually suspected that they would use the jet airliners as suicide weapons since it had never happened before in history; many previous hijacking attempts had been resolved with the passengers and crew escaping unharmed after obeying the hijackers. The hijackers—members of al-Qaeda's Hamburg cell—intentionally crashed two jet airliners into the Twin Towers of the World Trade Center in New York City. Both buildings collapsed within two hours from fire damage related to the crashes, destroying nearby buildings and damaging others. The hijackers crashed a third jet airliner into the Pentagon in Arlington County, Virginia, just outside Washington, D.C. The fourth jet airliner crashed into a field near Shanksville, Pennsylvania, after some of its passengers and flight crew attempted to retake control of the jet airliner, which the hijackers had redirected toward Washington, D.C., to target the White House or the US Capitol. None of the flights had any survivors. A total of 2,977 victims and the 19 hijackers perished in the attacks. Fifteen of the nineteen were citizens of Saudi Arabia, and the others were from the United Arab Emirates (2), Egypt, and Lebanon. On 13 September, for the first time, NATO invoked Article 5 of the North Atlantic Treaty, which commits each member state to consider an armed attack against one member state to be an armed attack against them all. The invocation of Article 5 led to Operation Eagle Assist and Operation Active Endeavour. On 18 September 2001, President Bush signed the Authorization for Use of Military Force Against Terrorists, which Congress had passed a few days earlier; the authorization remains in effect and has been used to justify numerous military actions.
American objectives
The Authorization for Use of Military Force Against Terrorists or "AUMF" was made law on 14 September 2001, to authorize the use of United States Armed Forces against those responsible for the 11 September attacks. It authorized the president to use all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on 11 September 2001, or harbored such organizations or persons, to prevent any future acts of international terrorism against the United States by such nations, organizations, or individuals. Congress declares this is intended to constitute specific statutory authorization within the meaning of section 5(b) of the War Powers Resolution of 1973. The George W. Bush administration defined the following objectives in the war on terror:
Defeat terrorists such as Osama bin Laden, Abu Musab al-Zarqawi and destroy their organizations Identify, locate, and demolish terrorists along with their organizations Reject sponsorship, support, and sanctuary to terrorists End the state sponsorship of terrorism Establish and maintain an international standard of responsibility concerning combating terrorism Strengthen and maintain the international effort to combat terrorism Function with willing and able states Enable weak states Persuade reluctant states Compel unwilling states Intervene and dismantle material support for terrorists Abolish terrorist sanctuaries and havens Reduce the underlying conditions that terrorists seek to exploit Establish partnerships with the international community to strengthen weak states and prevent (re)emergence of terrorism Win the war of ideals Protect US citizens and interests at home and abroad Integrate the National Strategy for Homeland Security Attain domain awareness Enhance measures to ensure the integrity, reliability, and availability of critical, physical, and information-based infrastructures at home and abroad Implement measures to protect US citizens abroad Ensure an integrated incident management capacity The 2001 AUMF has authorized the US president to launch military operations worldwide without congressional oversight or transparency. Between 2018 and 2020 alone, US forces initiated what it labelled "counter-terror" activities in 85 countries. Of these, the 2001 AUMF has been used to launch classified military campaigns in at least 22 countries. The 2001 AUMF has been widely perceived as a bill that grants the president powers to unilaterally wage perpetual "world wide wars".
Timeline
Operation Enduring Freedom
Operation Enduring Freedom is the official name used by the Bush administration for the War in Afghanistan, together with three smaller military actions, under the umbrella of the global war on terror. These global operations are intended to seek out and destroy any al-Qaeda fighters or affiliates. Originally, the campaign was named "Eternal Justice" but due to widespread controversy and condemnation in the Muslim world, the phrasing was changed to "Enduring Freedom".
Afghanistan
On 20 September 2001, in the wake of the September 11 attacks, George W. Bush delivered an ultimatum to the Taliban government of Afghanistan, the Islamic Emirate of Afghanistan, to turn over Osama bin Laden and al-Qaeda leaders operating in the country or face attack. The Taliban demanded evidence of bin Laden's link to 11 September attacks and, if such evidence warranted a trial, they offered to handle such a trial in an Islamic Court.
Subsequently, in October 2001, US forces (with UK and coalition allies) invaded Afghanistan to oust the Taliban regime. On 7 October 2001, the official invasion began with British and US forces conducting airstrike campaigns over enemy targets. Shortly after, Bush rejected a Taliban offer to hand over bin Laden on the condition the bombing campaign was halted, and by mid-November, Kabul, the capital city of Afghanistan, fell. The remaining al-Qaeda and Taliban remnants fell back to the rugged mountains of eastern Afghanistan, mainly Tora Bora. In December, Coalition forces (the US and its allies) fought within that region. It is believed that Osama bin Laden escaped to Pakistan during the battle. In March 2002, the US and other NATO and non-NATO forces launched Operation Anaconda, intending to destroy any remaining al-Qaeda and Taliban forces in the Shah-i-Kot Valley and Arma Mountains of Afghanistan. The Taliban suffered heavy casualties and evacuated the region. The Taliban regrouped in western Pakistan and began to unleash an insurgent-style offensive against Coalition forces in late 2002. Throughout southern and eastern Afghanistan, firefights broke out between the surging Taliban and Coalition forces. Coalition forces responded with a series of military offensives and an increase in troops in Afghanistan. In February 2010, Coalition forces launched Operation Moshtarak in southern Afghanistan along with other military offensives in the hopes that they would destroy the Taliban insurgency once and for all. Peace talks were also underway between Taliban affiliated fighters and Coalition forces. In September 2014, Afghanistan and the United States signed a security agreement that allowed U.S. and NATO forces to remain in Afghanistan until at least 2024. However, on 29 February 2020, the United States and the Taliban signed a conditional peace deal in Doha which required that US troops withdraw from Afghanistan within 14 months so long as the Taliban cooperated with the terms of the agreement not to "allow any of its members, other individuals or groups, including Al Qaeda, to use the soil of Afghanistan to threaten the security of the United States and its allies". The Afghan government was not a party to the deal and rejected its terms regarding release of prisoners. After Joe Biden became president, he moved back the target withdrawal date to 31 August 2021. On 15 August 2021, the Afghan capital Kabul fell to a surprisingly effective Taliban offensive, ending the war in Afghanistan. The US military and NATO troops took control of Kabul's Hamid Karzai International Airport for use in Operation Allies Refuge and the large-scale evacuation of foreign citizens and certain vulnerable Afghans, executed in cooperation with the Taliban. On 30 August 2021, the United States completed its hasty withdrawal of its military from Afghanistan. The withdrawal was heavily criticized both domestically and abroad for being chaotic and haphazard, as well as for lending more momentum to the Taliban offensive. However, many European countries followed suit, including Britain, Germany, Italy, and Poland. Despite evacuating over 120,000 people, the large-scale evacuation has also been criticized for leaving behind hundreds of American citizens, residents, and family members.
International Security Assistance Force
The NATO-led International Security Assistance Force (ISAF) was created in December 2001 to assist the Afghan Transitional Administration and the first post-Taliban elected government. With a renewed Taliban insurgency, it was announced in 2006 that ISAF would replace the US troops in the province as part of Operation Enduring Freedom. The British 16th Air Assault Brigade (later reinforced by Royal Marines) formed the core of the force in southern Afghanistan, along with troops and helicopters from Australia, Canada, and the Netherlands. The initial force consisted of roughly 3,300 British, 2,000 Canadian, 1,400 Dutch, and 240 Australian troops, along with special forces from Denmark and Estonia and small contingents from other nations. The monthly supply of cargo containers through Pakistani route to ISAF in Afghanistan is over 4,000 costing around 12 billion in Pakistani Rupees.
Philippines
In January 2002, the United States Special Operations Command, Pacific deployed to the Philippines to advise and assist the Armed Forces of the Philippines in combating Filipino Islamist groups. The operations were mainly focused on removing the Abu Sayyaf group and Jemaah Islamiyah (JI) from their stronghold on the island of Basilan. The second portion of the operation was conducted as a humanitarian program called "Operation Smiles". The goal of the program was to provide medical care and services to the Basilan region as part of a "Hearts and Minds" initiative. Joint Special Operations Task Force – Philippines disbanded in June 2014, ending a successful 12-year mission. After JSOTF-P had disbanded, as late as November 2014, American forces continued to operate in the Philippines under the name "PACOM Augmentation Team", until 24 February 2015. On 1 September 2017, US Secretary of Defense Jim Mattis designated Operation Pacific Eagle – Philippines (OPE-P) as a contingency operation to support the Philippine government and the military in their efforts to isolate, degrade, and defeat the affiliates of ISIL (collectively referred to as ISIL-Philippines or ISIL-P) and other terrorist organisations in the Philippines. By 2018, American operations within the Philippines against terrorist groups involved as many as 300 advisers.
Trans-Sahara (Northern Africa)
Operation Enduring Freedom – Trans Sahara (OEF-TS), now Operation Juniper Shield, is the name of the military operation conducted by the US and partner nations in the Sahara/Sahel region of Africa, consisting of counter-terrorism efforts and policing of arms and drug trafficking across central Africa. The conflict in northern Mali began in January 2012 with radical Islamists (affiliated to al-Qaeda) advancing into northern Mali. The Malian government had difficulty maintaining full control over the country. The fledgling government requested support from the international community in combating the Islamic militants. In January 2013, France intervened at the request of the Malian government and deployed troops to the region. They launched Operation Serval on 11 January 2013, with the hopes of dislodging the al-Qaeda affiliated groups from northern Mali.
Horn of Africa and the Red Sea
Operation Enduring Freedom – Horn of Africa is an extension of Operation Enduring Freedom. Unlike other operations within Operation Enduring Freedom, OEF-HOA does not have a specific organization as its target. OEF-HOA instead focuses its efforts to disrupt and detect militant activities in the region and to work with willing governments to prevent the reemergence of militant cells and activities. In October 2002, the Combined Joint Task Force – Horn of Africa (CJTF-HOA) was established in Djibouti at Camp Lemonnier. It contains approximately 2,000 personnel including US military and special operations forces (SOF) and coalition force members, Combined Task Force 150 (CTF-150). Task Force 150 consists of ships from a shifting group of nations, including Australia, Canada, France, Germany, Italy, the Netherlands, Pakistan, New Zealand, and the United Kingdom. The primary goal of the coalition forces is to monitor, inspect, board, and stop suspected shipments from entering the Horn of Africa region and affecting the United States' Operation Iraqi Freedom. Included in the operation is the training of selected armed forces units from Djibouti, Kenya, and Ethiopia in counter-terrorism and counter-insurgency tactics. Humanitarian efforts conducted by CJTF-HOA include rebuilding schools and medical clinics and providing medical services to countries whose forces are being trained. The program expands as part of the Trans-Saharan Counterterrorism Initiative, with CJTF personnel also assisting in training the armed forces of Chad, Niger, Mauritania, and Mali. However, the war on terror does not include Sudan, where over 400,000 have died in an ongoing civil war. On 1 July 2006, a Web-posted message purportedly written by Osama bin Laden urged Somalis to build an Islamic state in the country; warned Western governments that the al-Qaeda network would fight against them if they intervened there. The Prime Minister of Somalia claimed that three "terror suspects" from the 1998 United States embassy bombings are being sheltered in Kismayo. On 30 December 2006, al-Qaeda deputy leader Ayman al-Zawahiri called upon Muslims worldwide to fight against Ethiopia and the TFG in Somalia. On 8 January 2007, the US launched the Battle of Ras Kamboni by bombing Ras Kamboni using AC-130 gunships. On 14 September 2009, US Special Forces killed two men and wounded and captured two others near the Somali village of Baarawe. Witnesses claim that helicopters used for the operation launched from French-flagged warships, but that could not be confirmed. A Somali-based al-Qaida-affiliated group, the Al-Shabaab, has verified the death of "sheik commander" Saleh Ali Saleh Nabhan along with an unspecified number of militants. Nabhan, a Kenyan, was wanted in connection with the 2002 Mombasa attacks.
Military operations by country
Iraq War
2002 State of the Union Address
During his 2002 State of the Union Address, George W. Bush accused North Korea, Iran, and Iraq of propping up state-sponsored terrorism and pursuing Weapons of Mass Destruction. These countries were portrayed as a global threat and categorised under the terminology referred to as "Axis of evil". Regarding Iraq, Bush alleged: "Iraq continues to flaunt its hostility toward America and to support terror. The Iraqi regime has plotted to develop anthrax and nerve gas and nuclear weapons for over a decade. This is a regime that has already used poison gas to murder thousands of its own citizens, leaving the bodies of mothers huddled over their dead children. This is a regime that agreed to international inspections, then kicked out the inspectors. This is a regime that has something to hide from the civilized world."
Prelude
In October 2002, United States Congress passed the "Authorization for Use of Military Force Against Iraq Resolution of 2002", which empowered the US president to order military attack against Iraq. On 5 February 2003, Secretary of State Colin Powell made a presentation before the UN Security Council which claimed to implicate Iraq in building a secret WMD program and having ties to Al-Qaeda.
On 17 March 2003, Bush issued an ultimatum to Saddam Hussein and his two sons to flee Iraq within a 48-hour deadline or else face "military conflict". Justifying his policy Bush declared: "Terrorists and terror states do not reveal these threats with fair notice, in formal declarations—and responding to such enemies only after they have struck first is not self-defense, it is suicide. The security of the world requires disarming Saddam Hussein now."
Invasion of Iraq
The Iraq War began in March 2003 with an air campaign, which was immediately followed by a US-led ground invasion. The Bush administration cited UNSC Resolution 1441, which warned of "serious consequences" for violations such as Iraq possessing weapons of mass destruction. The Bush administration also stated the Iraq War was part of the war on terror, a claim later questioned and contested. Iraq had been listed as a state sponsor of terrorism by the US since 1990, when Saddam Hussein invaded Kuwait. The first ground attack came at the Battle of Umm Qasr on 21 March 2003, when a combined force of British, US and Polish forces seized control of the port city of Umm Qasr. Baghdad, Iraq's capital city, fell to US troops in April 2003 and Saddam Hussein's government quickly dissolved. On 1 May 2003, Bush announced that major combat operations in Iraq had ended.
