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The Yalta Conference was a meeting between the 3 leaders, United States Roosevelt, the Soviet Unions Stalin, and Great Britain's Winston Churchill. The purpose of this was to decide what to do with the defeated Germany's land. They decided to split the land into zones of occupation controlled with the allied military forces. Germany would also pay the Soviet Union in compensation for their losses. Winston had one condition to agree to this being, Stalin would give the Eastern Europeans free election, which he accepted.

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The United Nations was a international organization with 50 countries. All with the intent to help keep peace and prevent future wars. Within the UN was a security council with 11 members, the purpose of this group was for the people who had real power to be able to settle disputes and investigate any serious issues. 5 main members were Britain, China, United States, France, and the Soviet Union.

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The soviets had built a "wall of satellite nations". As the war had finished Stalin had went against the Yalta Conference and promise of allowing free elections in Eastern Europe. He had installed communism in all of the countries he had gotten as a buffer between them to protect the Soviet Unions western border, hence the name "wall of satellite nations" since they were just there for information and protection of the Soviets.

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American president Franklin D. Roosevelt had died. His successor was President Harry S. Truman, he was no pushover either, he gave Stalin a hard time.

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The Potsdam Conference was between Stalin, Churchill, and Americas new president Truman. This was to press Stalin into letting there be free elections in Eastern Europe, which Stalin said would never happen. He also said communism and capitalism cannot exist in the same world together and that this war between them is inevitable.

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Churchill had created a phrase to show Europe division, between communism and capitalism. An "iron curtain" was what he used to separate western Europe and Eastern Europe.

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As time had passed more tension had been built up. Truman had stopped being passive and pushed an aggressive policy to stop the Soviets spreading. This policy was named "containment" its purpose was to prevent the Soviets from expanding any further and creating alliances with weaker countries and help them resist the Soviets.

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The Truman Doctrine was support for that rejected communism. Most had argued that the United States didn't have the resources to state such a bold plan. Congress had quickly authorized the aid of $400 million in support to Turkey and Greece.

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The Marshall Plan was where America gave aid to any European country that needed it. The items of support include, food, machines, materials, and money. Congress debated on this 12.5 billion dollar plan on February 1948. The communists had taken over Czechoslovakia, congress was caught by surprise and instantly approved the plan.

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The Berlin airlift had started because the Soviets had taken over west Berlin and cut off the highways, water, and rail traffic to there, this made it hard for America to aid western Berlin in fighting back. In order to bypass this America and Britain flew planes over Berlin and airdropped them supplies for nearly 11 months.

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The Soviets had admitted defeat in holding west Berlin and lifted the blockade.

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All conflicts before this were the beginning of the Cold War. Hostility was being built up between the 2 nations and became more tense. Western Europeans were on high alert due to the Berlin blockade. As a result 10 western Europeans had made a alliance with America for defense. It was called the North Atlantic Treaty Alliance (NATO)

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Truman authorized the work on working to make a thermonuclear weapon. This new bomb was known as the H-bomb, a shortened name of hydrogen bomb. This was made to be extremely more lethal than any other atomic bombs.

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First successful test of the H-bomb was made with the Soviets soon to follow them.

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The Soviets had seen NATO as a threat to their nation. In response they created what was called the Warsaw Pact, it was a alliance between the Soviet Union and its countries under their control.

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Soviets announced the development of a rocket that can travel a lot of distance, also know now as an Intercontinental Ballistic Missile(ICBM).

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The Soviets had used this ICBM to push their first satellite into the atmosphere, this was named Sputnik I. The Americans started to be scared that they were falling behind.

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The Soviets had shot a U-2 plane and taken the piolet hostage with the intent to put him in jail for 10 years. They released him after 19 months due to the pressure that was being put on them.