A meeting between Roosevelt, Stalin, and Churchill to determine the eventual fate of Germany and Poland. Germany was determined to be divided into four separate war occupation zones, with one portion each going to Britain, France, the United States, and the U.S.S.R. However, when Stalin also demanded that $20 billion in reparations be paid by Germany, Churchill and Roosevelt refused. Finally, Russia ceded control of Poland to an extent, but would not allow it to have completely free, democratic elections.
A phrase coined by Winston Churchill describing the wall of separation between moderate capitalist and communist countries, rapidly spreading after reaching the borders of West Germany and Austria, seeking to oppress all of Europe at one point.
An idea created through Kennan's studies saying that Eastern Europe had no chance against the communists, and it would be better for "nature to take its course" and leave it alone. Instead, it would be more auspicious if they attempted to stop Soviet movements in other regions of the world, creating communism in those areas.
A new policy for foreign relations created in March 1947 when Britain was unable to protect Greece and Turkey from U.S.S.R. involvement any longer. This policy stated that the United States must help the minor countries decide for themselves what government should be, defending them against the Soviet power. This set a precedent for foreign involvement overseas in far greater volume; indeed, the U.S. set up military bases in Greece and Turkey only a few months later.
A proposal by the current U.S. Secretary of State (whose name is in the answer) to the nations of Europe calling for them to craft a plan to assist themselves and facilitate economic recovery, which the United States would then fund to make sure that they were able to begin producing goods and keep themselves from falling into Communist hands. Overall, this proposal ended with over $13 billion in aid spent over seventeen nations.
An operation carried out by U.S. and British troops to provide supplies to the 2.5 million people in West Berlin now that Stalin had closed the supply routes. This kept the Western powers from being forced to abandon the city in Communist hands. For 15 months, food, fuel, and other supplies were continually delivered, and the Soviets opened their blockade in mid-1949.
An organization of democratic Western nations grouped together to defend themselves and other countries against the Soviet Union. While being controversial, as this would lead to enormous amounts of arms being developed from both nations, it was agreed to and in April 1949, the U.S. and Canada joined ten European nations in this treaty, saying that "an armed attack against one...shall be considered an attack against them all." This also set an American precedent of being actively involved in foreign affairs.
An alliance similar to NATO with the satellite Communist nations of Europe joined together with the Soviet Union to defend against the Western powers.
A new practice set up by Eisenhower in 1954 after the Soviet Union had tested its first thermonuclear device, calling for plans to make the United States' power so immense that no country would dare to attack it "for fear of retaliation." This led to 19 hydrogen bomb tests between '54 and '58, and make the U.S. more powerful than ever.
Missiles developed by the Soviet Union to fire at the United States if an attack became necessary, able to travel several thousand miles to pinpoint target a location to bomb. The United States attempted to develop these missiles as well, but had little progress.
The first artificial satellite ever developed, this machine was launched in 1957 by the Soviets using an ICBM, in order to make a statement of their power and ability to bomb the U.S. This terrified Americans with the fear that a bomb could travel with apparent ease to them.