Before 1940, the Japanese empire stood as the greatest single threat to the American presence in the Pacific and East Asia. To a lesser degree, the formerly hegemonic colonial powers of Britain, France, and the Netherlands still controlled portions of the region. At the same time, subjugated peoples in East Asia and Southeast Asia struggled to throw off colonialism. By the late 1930s, the competition exploded into armed conflict. Japan looked like the early victor, but the United States eventually established itself as the hegemonic power in the Pacific Basin by 1945. Yet when it comes to the American movement out into the Pacific, there is more to the story that has yet to be revealed. In this work, editor Hal Friedman brings together nine essays that explore lesser known aspects and consequences of America's military expansion into the Pacific during and after World War II.