Key dates in U.S. war in Afghanistan since Sept. 11, 2001 - Action News
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Key dates in U.S. war in Afghanistan since Sept. 11, 2001

The last U.S. troops flew out of Afghanistan, fulfilling President Joe Biden's pledge to bring an end to America's longest war after a chaotic and violent evacuation from Kabul.

Last U.S. troops flew out of Kabul on Monday, ending America's longest war

U.S. marines are seen in Herati, Afghanistan, in July 2009. The last U.S. troops flew out of Afghanistan on Monday, fulfilling President Joe Biden's pledge to bring an end to America's longest war. (Joe Raedle/Getty Images)

The last U.S. troops flew out of Afghanistan, the military said on Monday, fulfilling President Joe Biden's pledge to bring an end to America's longest war after a chaotic and violent evacuation from Kabul.

The following is a chronology of U.S. involvement and major developments in Afghanistan over the past two decades:

Sept. 11, 2001

U.S. involvement in Afghanistan is triggered by attacks on the United States plotted in Afghanistan by the al-Qaeda militant group, led by Osama bin Laden, who was in Afghanistan under Taliban protection.

Oct. 7, 2001

U.S. forces begin air campaign with strikes on Taliban and al-Qaeda forces. Small numbers of U.S. special forces and CIA agents soon slip into Afghanistan to help direct the bombing campaign and organize Afghan opposition forces. The Taliban would swiftly be toppled, however, with no major U.S. combat deployment on the ground.

Anti-Taliban Afghan fighters as the U.S. conducts airstrikes in the Tora Bora mountains in Afghanistan in December 2001. (Erik de Castro/Reuters)

Nov. 13, 2001

U.S.-backed Northern Alliance forces enter Kabul as the Taliban withdraw south. Within a month, Taliban leaders have fled from southern Afghanistan into Pakistan.

December 2001

U.S. forces bomb the Tora Bora cave complex in eastern Afghanistan where bin Laden is reported to be hiding, but he slips over the border into Pakistan, where he disappears.

May 2, 2003

U.S. officials declare an end to major combat operations in Afghanistan. Under President George W. Bush, the U.S. focus turns to preparing for the invasion of Iraq, which required a diversion of U.S. troops, equipmentand intelligence collection from Afghanistan. That allows the Taliban to slowly regroup, at first in the south and east.

The UN authorizes a NATO-led missionwith the goal of stabilizing Afghanistan and establishing a new government. Canada is part of this mission, initially with about 700 soldiers deployed in Kabul and another 200 more in the country's southwest.

U.S. President George W. Bush meets with Afghanistan President Hamid Karzai of at the White House in February 2003. (Alex Wong/Getty Images)

2006-08

With U.S. forces mainly fighting a surge campaign in Iraq, only a much smaller contingent is deployed in Afghanistan. The Taliban launch major advances threatening to recapture swaths of territory, especially in the south. In response, an enlarged NATO mission brings thousands more troops, notably British forces, hundreds of whom are killed in intense battles against the Taliban in Helmand province. Canada's contribution will eventually grow to about2,300, stationed mainly in and around Kandahar.

Feb. 17, 2009

As Washington draws down in Iraq, newly inaugurated President Barack Obama decides to ramp up the force in Afghanistan. In his first major military decision as commander in chief, he orders in 17,000 more combat troops to reinforce 38,000 U.S. troops and 32,000 from some 40 NATO allies already on the ground. Later that year, with generals recommending a "surge" campaign similar to the one waged in Iraq in 2006-07, Obama would order an even larger buildup. The U.S. contingent would exceed 100,000 by the middle of 2010, carrying out extensive counter-insurgency operations across the country.

May 1, 2011

Bin Laden is killed in a raid by U.S. forces in Pakistan.

WATCH |Obama announces death of Osama bin Laden:

Barack Obama announces death of Osama bin Laden

12 years ago
Duration 9:40
On May 2, 2011 at 11:35 p.m. (EST) , from the East Room at the White House, President Barack Obama announced to the world that the United States had killed Osama bin Laden.

December 2011

U.S. officials say U.S. diplomats have held about half a dozen secret meetings with Afghan Taliban contacts over the previous 10 months, mostly in Germany and Qatar.

Canada's combat mission to Afghanistan ends, though soldiers stay in a training role until March 2014. In the end, more than 40,000 Canadian personnel served in Afghanistanbetween 2001 and 2014, with 158 losing their lives.

May 27, 2014

Following the surge campaign of Obama's first term, Washington rapidly draws down its forces and switches its emphasis to training and supporting the Afghan military. Obama outlines a plan to withdraw all but 9,800 American troops by the end of the year and pull out the rest by the end of 2016.

Dec. 28, 2014

The U.S. combat mission is officially concluded after the withdrawal of most combat troops and a transition to an "Afghan-led" war.

Cmdr. Sgt. Maj. John Etter salutes Afghan soldiers in Kabul in March 2014. (Scott Olson/Getty Images)

Aug. 21, 2017

U.S. President Donald Trump announces his strategy, calling for a small, open-ended deployment of U.S. forces providing support to Afghans, with the goal of forcing the Taliban to negotiate peace with the Kabul government.

Feb. 29, 2020

Under Trump, Washington signs an agreement with the Taliban in Doha to withdraw all U.S. troops. The Taliban agree to halt attacks on U.S. forces, not to let their territory be used for terrorism and to hold talks with the Afghan government, although those talks would subsequently prove fruitless.

April 14, 2021

Biden announces U.S. forces will withdraw unconditionally by Sept. 11, implementing the agreement reached with the Taliban by his predecessor, Trump.

WATCH |Biden to withdraw U.S. troops from Afghanistan by Sept. 11:

Biden to withdraw U.S. troops from Afghanistan by Sept. 11

3 years ago
Duration 2:04
The U.S. and NATO announce they will pull their troops out of Afghanistan by Sept. 11, 20 years after the terror attacks on the U.S. But experts are concerned the withdrawal could stall peace talks between the Taliban and the Afghan government.

July 2, 2021

U.S. troops abruptly pull out of their main base at Bagram airfield 60 kilometres north of Kabul.

Aug. 15, 2021

After a stunning week-long advance capturing cities across the country, the Taliban seize Kabul without a fight. President Ashraf Ghani flees the country. The United States and Western allies launch an urgent airlift from Kabul airport to bring out their own citizens and tens of thousands of Afghans who aided them.

WATCH |Desperate Afghans flock to Kabul airport in attempts to flee:

Desperate Afghans flock to Kabul airport in attempts to flee

3 years ago
Duration 2:21
As the Taliban tightens its hold on Afghanistan, desperate people flocked to Kabuls airport as a last resort to try and get onto planes headed west.

Aug. 26, 2021

Islamic State launches a suicide bomb attack on the crowded gates of Kabul airport, killing scores of civilians and 13 U.S. troops, the deadliest incident for U.S. forces in Afghanistan in more than a decade.

Aug. 30, 2021

U.S. General Frank McKenzie, head of U.S. Central Command, announces completion of the U.S. troop withdrawal.

With files from CBC News