One war, four US presidents
Four US presidents have overseen America’s presence in Afghanistan over the past two decades.
It was George W Bush who sent forces in back in 2001 after the terror attacks of 9/11.
Barack Obama dealt with the conflict throughout his two terms, authorising a surge of US troops.
Donald Trump promised to bring those Americans home and signed a deal with the Taliban.
It fell to Joe Biden to execute that withdrawal and he oversaw for the mass evacuation we’ve seen over the past two weeks.
How they handled the conflict was shaped by conditions on the ground, but also by their distinctive views on American values and interests.
A presidential historian and national security expert assess how they will be remembered.