Answer:
I am not writing you an entire essay, but here are some main points:
The United Stated had to contain communism from spreading through out Berlin, Korea, and Cuba. The United States contained communism by airlifting supplies to Berlin, sending troops to Korea, and set up a blockade/quarantine to keep out the communist Soviet Union.
The domino theory was a Cold War policy that suggested a communist government in one nation would quickly lead to communist takeovers in neighboring states, each falling like a perfectly aligned row of dominos
Step-by-step explanation: