Маркус, if only your history was as busy getting informed as your posting are busy....
Chiang Kai-shek, who led China [ until the CCP came to power in 1949 ] was an ally in the Pacific War.
If you had consulted any of the online source, the allies against Imperial Japan were "The major Allied participants included China, the United States, the United Kingdom, Australia, New Zealand and the Netherlands. China had already been engaged in a war against Japan since 1937. "
"We" is a pronoun which includes our allies. Even the little Netherlands.
But in terms of making Japan surrender, it was the American atomic bombs that did that. How many bombs did the Chinese drop on Japan?
The Dutch East Indies (present-day Indonesia) belonged to the Netherlands at the time and were invaded by Japan. So naturally the Netherlands, although occupied by the Germans, were part of the alliance against Japan.
America nuked Japan and won the war. China didn’t do squat.