Don't worry, America will defend you all against Communism!
Yay, thanks America!
Formation of NATO
The Truman Doctrine was an American foreign policy stating that the US should give support to countries threatened by Soviet forces or Communist insurrection.
Satellite Nations are nations that are politically and economically controlled by another, more powerful country. At this time, many countries in Eastern Europe were satellite nations under the Soviet Union.
NATO was formed in 1949, creating a defensive alliance between nations in Western Europe, and the US (12 countries in total).
The Iron Curtain was the political and military barrier that isolated Soviet-controlled countries of Eastern Europe after WWII.
When West Berlin was blockaded by the Soviets, American planes went over the area and dropped supplies to those who were trapped.
The Arms Race was the tension-filled, anxious race between nations on who could build up powerful arms first, specifically nuclear weapons.