It wasn’t that long ago that the U.S. and China sought closer economic relations. David Dollar was at the heart of that engagement, first as a World Bank economist and then as Treasury official, advising both Washington and Beijing on ways to move forward together. During the 2009 global financial crisis, Wang Yang, a senior Communist party official who was then running Guangdong province in southern China, turned for advice to the World Bank’s Beijing office headed by Dollar. A