During the Cold War, Europe was America’s strategic priority. East Asia was largely a sideshow, even though the United States fought bloody wars in Korea and Vietnam, and also provided security for Japan, South Korea, and Taiwan. But in the unfolding new cold war between the US and China, America’s strategic priorities have flipped. Today, US security strategy is dominated by the China threat, and East Asia has replaced Europe as the principal theater of the world’s defining geopolitical contest. And the security consequences of this shift in America’s focus are becoming increasingly visible.