Since the end of World War II, U.S. strategy in Asia has relied on increasingly integrated partnerships with regional allies. Of those, Australia, Japan, and South Korea have been among the United States’ most reliable associates in solving regional and global problems. But political change in the United States has ushered in an era of retrenchment. The Trump administration is questioning the value of U.S. alliances and scrutinizing the cost of long-standing security ties.