Tensions over Japanese expansion in China and the Western oil embargoes that led to the "Southern Plan".
The Pacific War was decided by American industrial might, strategic air and naval superiority, and the brutal "island-hopping" campaign that eventually brought the war to the Japanese home islands. II. The Rising Tide (1941–1942) The Pacific Strategy, 1941-1944 | The National WWII Museum WWII – Battle Over The Pacific
Geographically the largest theater of WWII, involving the Pacific, Indian Oceans, and East/Southeast Asia. Tensions over Japanese expansion in China and the