If you like neat lines, tidiness and admire symmetry, what's not to like about the decision of Joe Biden to pull American combat troops out of Afghanistan by 11 September 2021 - exactly 20 years on from 9/11?
In modern day America it often feels that all roads lead back to 9/11; the single most defining - and scarring - event since Pearl Harbor: the surprise attack by the Japanese on America's Pacific fleet, which would ultimately bring America into World War Two.
