I believe that the United States had no imperialistic motives for entering WWII. Because Great Britain, Russia, and Germany all used to be empires at some point in their history, and they might have wanted to become empires again, whereas America had no such wishes.
The Philippine-American War, 1899–1902. After its defeat in the Spanish-American War<span> of 1898, Spain ceded its longstanding colony of the </span>Philippines<span> to the United States in the Treaty of Paris. ... As many as 200,000 </span>Filipino<span> civilians died from violence, famine, and disease.</span>
A Britain Had a bigger air force than the third Reich.