WORLD HISTORY

Detailed explanation-1: -Seeking raw materials to fuel its growing industries, Japan invaded the Chinese province of Manchuria in 1931. By 1937 Japan controlled large sections of China, and war crimes against the Chinese became commonplace.

Detailed explanation-2: -The third period of League history, the period of conflict, opened with the Mukden Incident, a sudden attack made on September 18, 1931, by the Japanese army on the Chinese authorities in Manchuria. This was clearly an act of war in violation of the Covenant.

Detailed explanation-3: -However, in 1931, Japan violated both the Nine-Power Treaty and the Open Door Policy when they invaded Manchuria, an event known as the Mukden Incident.