The inconclusive outcome of the Korean War left a peninsula divided between two nations engaged in a deadly cold war. An important aspect of the continuing hostilities was America's security guarantee to South Korea. Despite enormous geopolitical changes brought by the accelerating collapse of communism, the United States has a standing pledge to go to war if necessary to thwart a North Korean attack. This volume assesses the current and future viability of the U.S.-South Korean alliance from military, political, and economic perspectives.