They quickly went from allies to enemies. There was heavy mistrust between each other based on the ideologies of communism and capitalism.
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.
"a. establish foreign policy" "e. declare war" and "<span>c. maintain armed forces" are the only options from the list that the Constitution gives specifically to the national government, since these are explicit powers. </span>