9/11 and the War on Terror

The terrorist attacks of 11 September 2001 were the most devastating act of terrorism in history. They killed nearly 3,000 people and transformed American foreign policy, leading to the declaration of a global "War on Terror" that would shape the next two decades. This lesson examines the attacks, their background, and the US response.

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Background: Al-Qaeda and Osama bin Laden

The 9/11 attacks were carried out by al-Qaeda, an Islamist terrorist organisation led by Osama bin Laden.

Key Facts	Detail
Leader	Osama bin Laden (Saudi-born; son of a billionaire construction magnate)
Founded	Late 1980s, during the Soviet-Afghan War
Ideology	Extreme Islamist; opposed Western influence in Muslim lands; sought to establish a global caliphate
Base	Afghanistan, under the protection of the Taliban (from 1996)
Previous attacks	Bombing of US embassies in Kenya and Tanzania (1998, 224 killed); attack on USS Cole in Yemen (2000, 17 killed)

Why Did Bin Laden Target the USA?

Grievance	Explanation
US troops in Saudi Arabia	After the Gulf War, American military bases remained in Saudi Arabia — home to Islam's holiest sites (Mecca and Medina)
Support for Israel	US support for Israel was seen as oppression of Palestinians
Sanctions on Iraq	The suffering of Iraqi civilians under sanctions was blamed on the USA
Western influence	Bin Laden viewed Western culture and values as a threat to Islam
1998 fatwa	Bin Laden issued a fatwa (religious ruling) calling on Muslims to kill Americans everywhere

Exam Tip: Understanding al-Qaeda's motivations is important for explaining why 9/11 happened. You do not need to agree with their reasoning, but you must be able to explain it. This is a common exam question.

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The 9/11 Attacks (11 September 2001)

On the morning of 11 September 2001, 19 al-Qaeda hijackers seized four commercial aircraft.

Flight	Target	Outcome
American Airlines 11	North Tower, World Trade Center, New York	Struck at 8:46 AM; tower collapsed at 10:28 AM
United Airlines 175	South Tower, World Trade Center, New York	Struck at 9:03 AM; tower collapsed at 9:59 AM
American Airlines 77	The Pentagon, Washington, D.C.	Struck at 9:37 AM; 125 killed in the building
United Airlines 93	Believed target: US Capitol or White House	Passengers fought back; plane crashed in a field in Shanksville, Pennsylvania at 10:03 AM

The Death Toll

Location	Deaths
World Trade Center	2,753
Pentagon	184
Shanksville, PA	40
Hijackers	19
Total	2,996

flowchart TD
  A[9/11 attacks 11 September 2001] --> B[Approx 2,996 killed]
  A --> C[NATO Article 5 invoked]
  A --> D[Bush addresses Congress 20 Sep 2001]
  D --> E[War on Terror declared]
  E --> F[AUMF signed 18 Sep 2001]
  E --> G[USA PATRIOT Act 26 Oct 2001]
  E --> H[Bush Doctrine: pre-emption]
  H --> I[Operation Enduring Freedom 7 Oct 2001]
  H --> J[Axis of Evil speech 29 Jan 2002]
  J --> K[Iraq, Iran, North Korea]
  E --> L[Guantanamo Bay opens 11 Jan 2002]

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The Immediate Response

The attacks had an enormous immediate impact on the United States and the world.

Response	Detail
National shock and grief	The attacks were witnessed live on television; images of the towers collapsing were broadcast worldwide
US airspace closed	All civilian aircraft were grounded for several days
Stock markets	New York Stock Exchange closed for four days; markets fell sharply on reopening
Surge of patriotism	Overwhelming national unity; approval ratings for President George W. Bush soared to over 90%
International solidarity	NATO invoked Article 5 (collective defence) for the first time in its history
Islamophobia	Hate crimes against Muslims and those perceived as Muslim increased sharply

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The War on Terror

On 20 September 2001, President Bush addressed Congress and declared a "War on Terror."

Key Principles

Principle	Explanation
"You are either with us or against us"	Countries were told to choose sides — no neutrality
Pre-emptive action	The USA reserved the right to strike before threats materialised (the Bush Doctrine)
Regime change	Governments that harboured or supported terrorists would be targeted
Global scope	The War on Terror was not limited to one country or one group — it was a worldwide campaign

Key Term: Bush Doctrine — the policy of pre-emptive military action against perceived threats, even before those threats had fully materialised. This was a major departure from the traditional approach of containment and deterrence.

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The Patriot Act (October 2001)

In response to 9/11, Congress passed the USA PATRIOT Act (Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism).

Feature	Detail
Surveillance	Expanded government powers to monitor communications (phone calls, emails, internet activity)
Detention	Allowed the detention of non-citizens suspected of terrorism without trial
Financial tracking	Enhanced ability to track terrorist financing
Criticism	Civil liberties groups argued it violated constitutional rights (privacy, due process)
Guantanamo Bay	A detention facility in Cuba where suspected terrorists were held without trial; allegations of torture

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The "Axis of Evil" (January 2002)

In his 2002 State of the Union address, President Bush identified an "Axis of Evil" — three countries he accused of supporting terrorism and seeking WMD.

Country	Allegation
Iraq	Pursuing WMD; defying UN resolutions
Iran	Supporting terrorist groups (Hezbollah); pursuing nuclear technology
North Korea	Developing nuclear weapons; selling missile technology

Exam Tip: The "Axis of Evil" speech is significant because it linked the War on Terror to the issue of WMD proliferation and signalled that the USA was preparing for action beyond Afghanistan — particularly against Iraq.

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Key Figures

Person	Role
George W. Bush	US President (2001–2009); declared the War on Terror
Osama bin Laden	Leader of al-Qaeda; mastermind of the 9/11 attacks
Dick Cheney	Vice President; influential advocate for aggressive action
Donald Rumsfeld	Secretary of Defense; oversaw military operations
Colin Powell	Secretary of State; initially more cautious than other advisors
Tony Blair	British Prime Minister; staunchest international ally of the USA

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Extended Worked Paragraph: Q7 Importance Question

Question: "The attacks of 11 September 2001 were the most important turning point in US foreign policy in the period 1990–2009." How far do you agree? (12 marks, AO1 + AO2)