Question

Which country was an ally of the united states during world war ii?

Answer 1

During World War II there were two sides: the Allies, which the US were a part of, which included, among others, UK, France, Soviet Union (after 1941), and the allies (Germany, Japan, Italy and their puppet states).

So the answer can be any of the allies: UK, France, Soviet Union but also the whole of Latin America, most of Africa and Asia. 

Answer 2

Great Britain, Canada, etc. ....