Whatever Japan and China were doing is none off America's business.
Japan had no business interfering in China.
By the way: point 10:
The Covenant of the League of Nations | UN GENEVA
And China had a right to ask for help and did ask for it in 1931.
America chose to involve itself in someone else's war. They play world police. That's all I said.
Nope. Japan had no right to attack anyone either. They chose to bomb Pearl Harbor, they chose war.