Meanwhile, in 1931, the Manchurian Crisis occurs. This is yet another area of China that Japan has taken as they took Formosa and Korea during the First Sino-Japanese War.
The occupation of Manchuria lasts until 1937 when the Second Sino-Japanese War commences.
The Second Sino-Japanese War coincides with World War two, and the USA enters the War on the side of the Allies (with China) when Japan bombs Pearl Harbour.
In response, the US drops atomic bombs on Hiroshima and Nagasaki in 1945, ending the War in the Pacific.