Question

to stop the spread of communism after world war ii, the united states established a policy known as containment detente isolationism security

Explanation:

After World War II, the U.S. adopted a policy focused on halting the expansion of Communist influence globally. Detente refers to later relaxed tensions with Communist powers, isolationism is avoiding foreign entanglements (not post-WWII U.S. policy), and "security" is too vague. Containment was the specific policy for this goal.

Answer:

containment