1. Secret development of atomic bomb – proved the U.S. didn’t trust the Soviets

2. Containment – how the U.S. decided to fight Communism

3. Truman Doctrine – U.S. should support free peoples fighting communism

4. Marshall Plan – U.S. gave money to Western Europe after World War II in an effort to keep countries democratic

5. Reunification of Germany – caused more tension between the U.S. and the U.S.S.R.

6. Berlin Airlift – massive transportation of food into democratic Germany

7. Sputnik – Soviet satellite; first man made satellite launched into space

8. Julius and Ethel Rosenberg – convicted of espionage (spying) and sentenced to death.

9. Korean War – began when the communist North invaded the democratic South

10. UN troops – fought alongside U.S. troops in the Korean war

11. Douglas McArthur – U.S. military leader fired by Truman for insubordination.

12. Outcome of the Korean War – not much was changed