Mezue ahịrịokwu na-esonụ: N'afọ 1941, United States mere ọtụtụ mkpebi iji kwado China n'agha ya na Japan: E nyere Lend Lease mgbe Onyeisi ala Franklin D. Roosevelt kwusịrị na ịgbachitere China dị mkpa maka ịgbachitere United States. N'oge okpomọkụ, ka Japan kwagara n'ebe ndịda n'ime French Indo-China, US, Britain na Netherlands tinyere mmachibido mmanụ na Japan, na-egbochi 90% nke ọkọnọ ya. Mmachibido iwu ahụ yiri ọrụ ndị agha Kwantung egwu, nke nwere ihe karịrị otu nde ndị agha nọ na China. Japan zaghachiri mwakpo a haziri nke ọma na Disemba 7/8, n'otu oge ahụ na-awakpo Pearl Harbor, Philippines,
Malaya, Singapore, Hong Kong, Guam, Wake Island, na Thailand.