Taiwan’s largest trading partner is the People’s Republic of China. By a significant margin. The two sides of a strait that are separated by competing political claims, opposing military forces, and seventy-five years of antagonism trade more with each other than Taiwan trades with the United States and Japan combined. This fact sits at the center of the Taiwan strategic problem in a way that military analysis consistently underweights: the economic integration that has developed between Taiwan and China since the 1990s has created dependencies that shape the behavior of Taiwanese businesses, the political calculations of Taiwanese voters, and the investment decisions of multinational companies with operations on both sides.