What happened after Japanese soldiers overtook Nanjing? What is this known as?

The Second Sino-Japanese War was the largest Asian war in the 20th century. ... In 1931, the Mukden Incident helped spark the Japanese invasion of Manchuria. The Chinese were defeated and Japan created a new puppet state, Manchukuo; many historians cite 1931 as the beginning of the war.

Explanation:

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.