Why did the United States take a more active role in world politics after World War II? A.
New nationalist powers in South America and Australia threatened the United States.

B.
The United States distrusted its allies and suspected that many of them were communists.

C.
Countries such as Great Britain and France were no longer powerful enough to police the globe.

D.
Countries such as Great Britain, France, and the Soviet Union took an isolationist stance after World War II.