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"The US was largely uninvolved from the start of WW II in Asia with the Marco Polo Bridge Incident on 7 July 1937 until after the attack on Pearl Harbor in December 1941. The war was half over before the US became an official combatant. Although WW II for China doesn’t really end until 1949 with the expulsion of all foreign influences."

You lying sack of Communist Chinese propaganda!:

1. The US stood up for Manchuria and China in the League of Nations and imposed embargoes on the Japanese to try to restrain their open violations of international law. The Japanese answered by leaving the League.

2. In June 1941, the first aircraft and American pilots of the American Volunteer Group - the Flying Tigers - began operations in China against the Japanese. There were also large investments in combat materiel and humanitarian aid to the Chinese people from the US and other Allied nations. The US provided massive aid to China throughout the war and hundreds - perhaps thousands - of Americans died in China to help save China.

WWII ended with the unconditional surrender of the Japanese in August 1945. You Chinese Communists used the weakened state of the Nationalist Chinese Army (and the relatively uncommitted and unused forces of the communists) to overthrow the Nationalists and seize control of China in 1949.

Pound sand, enemy agent!

The US was not a member of the League of Nations. It did sit in on conferences and participate to a degree. It did nothing effective following the Mukden incident and the conquest of Manchuria.

https://history.state.gov/milestones/1921-1936/mukden-incident

The United States and other western powers were at a loss on how to respond to the rapidly developing crisis. Even as the Japanese moved far from the original site of the “attack” at Mukden to bomb the city of Jinzhou (Chinchow), there was little sense that U.S. interests in the area were anywhere near profound enough to make military intervention necessary or desirable. Given the 1930s worldwide depression, there was little support for economic sanctions to punish the Japanese. Instead, the United States sat in on League of Nations council meetings for the first time to try to convince the League to enforce the Kellogg-Briand Pact, which both Japan and China had signed. Appeals based on the pact, however, proved ineffective.

Not until 1940 did the US start to embargo Japan.

Japan, China, the United States and the Road to Pearl Harbor, 1937–41

https://history.state.gov/milestones/1937-1945/pearl-harbor