As US-led troops withdraw after 20 years, the Taliban have made a swift return to power.

Four presidents have overseen the war in Afghanistan - with four different approaches.

Charmaine Cozier asks which of them is most responsible for how events have unfolded and ultimately setting the path to failure.

Produced by Ben Cooper

(Image: A US marine walks past an American flag attached to concertina wire at Camp Rhino in Southern Afghanistan. Credit: Rick Loomis/Los Angeles Times/AFP via Getty Images)