1999 - Formation of Taliban and Al-Qaeda.

2001 - The 9/11 attack.

2001 - War against Terrorism declared.

2001 - Bin Laden escapes, and Taliban escapes.

2002 - Reconstruction of Afghanistan started.

2003 - NATO takes control over the Afghanistan's force.

2004 - Formation of the Constitution of Afghanistan. 

2004 - New President of Afghanistan elected.

2005 - Pact between the United States and Afghanistan on military relations.

2006 - Major fights between the Armed forces and Taliban.

2007 - Taliban's commander executed.

2008 - 140 civilians died during the anti-terror operation.

2009 - A new strategy under leadership of President Obama, military command changed.

2009 - Afghan Presidential elections.

2010 - Highest command of the military changed.

2011 - Bin Laden killed.

2011 - 10 years of war.

2012 - Peace talks cancelled between the United States and the Taliban.

2013 - Afghanistan's security handed over by NATO to Afghan forces.

2014 - Obama announces troop withdrawal.

2014 - Power sharing agreement signed between the President of Afghanistan and a major opponent.

2017 - U.S. attacks Islamic State redoubt.

2017 - Trump signals prolonged Afghan war.

2018 - Taliban does major attacks against U.S.

2019 - U.S. - Taliban peace talks progresses.

2019 - Trump calls off peace talks.

2020 - Peace talks takes off.

2020 - U.S. announces troop withdrawal.

2021 - Biden announces to complete the withdrawal by 9/11 of 2021.

2021 - Twenty year long war ends as U.S. completes withdrawal on August 30, 2021.