Poland was divided between Germany and the USSR during the Nazi-Soviet pact
Truman believed Americans had to Contain Communism to the countries it was already in. He sought aid for Greece and Turkey to stop Communist rebels.
Stalin blockaded West Berlin from W. Germany. Soviets wanted a divided Germany.
Soviets had spies working on the Manhattan project and had leading German scientists.
Western allies formed a military alliance because of their fear of the USSR.
Joe McCarthy led the HUAC subcommittee to look for communists, he didn't find any, but caused paranoia throughout the USA.
Americans and Allies attempt to stop the spread of communism in Korea. End up in a war with China.
This was a military alliance of Eastern European nations and the USSR as a military alliance.
Soviets clamped down on liberal movement in Hungary wtih the army.
This was a terrible shot to American creadability because Eisenhower had made a commitment not to fly these over USSR.
The world was on the brink of nuclear annialation.