Richard N. Haass is President of the Council on Foreign Relations.
History at any moment can be understood as a snapshot, telling us where we are; or as a moving picture, telling us not just where we are but where we have been and where we may be headed. It is a distinction with an enormous difference.
US President Donald Trump with North Korean leader Kim Jong-un during a break in talks at the summit in Hanoi. (AFP)
US troops in Afghanistan. (AFP/File)