William Bratton is author of "China's Rise, Asia's Decline." He was previously head of equity research, Asia-Pacific, at HSBC.
Afghanistan is not the first country to find itself on the wrong side of a change in U.S. foreign policy, and nor will it be the last. Like other great powers throughout history, America has a rich tradition of discarding allegiances once they are no longer important to its changing political, ideological or economic priorities.
