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Rivalry over economic development between United States and Russia. Bolsheviks took power during Revolution in Russia.

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After years Soviets and Americans had finally formed diplomatic relations

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Soviet Union joined United States and Britain who they never realize trusted. They invaded Russia and kept their agreement.

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In late August 1939, Hitler and Stalin had signed the German-Soviet nonaggression pact, just a week later Germany would invade Poland. A few days after that France and Great Britain declared war on Germany.

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By 1940 Germany and the Soviet Union had taken full control over Poland and many other countries.

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In 1941, Hitler began Operation Barbarossa. Barbarossa was the nazis code name for the invasion of the Soviet Union. The German troops failed to invade the Soviet Forces, which would be a big turning point in the war.

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As the war continued more battles were fought and more countries would get involved. In 1945 Hitler committed suicide and just a week later germany would surrender

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There were troubles between Soviet Union and United States involving communist controls. Conflict was also arrising becuase Germany divided intofour occupation zones.

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The cold war grew from the tensions between the two nations. They were fighting over power, the use of nuclear weapons, and the ongoing fear of communism in the U.S

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The Marshall Plan. This plan called for $13 billion of economic aid to rebuild nations of Western Europe. America wanted to prevent the spread of commusism.

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North Atlantic Treaty Organization (NATO) was formed. It created a military alliance in Western Nations to stop Soviet threat.

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The Korean War. The Korean War was an important development to the Cold War. This was becuase there were tenstions built between United States and Soviet Union. Becuase of this the United States wanted to continue having a strong military and constrictng communism.

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At this point the Korean War has ended and tensions were very high between the United States and The Soviet Union. The battle of power between the two countries would soon lead into the start of the Cold War

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The Cuban Revolution. This started a relationship between U.S and Cuba. U.S had conflicting views on Cuba's new government and feared that communism would spread. This new regime would become a ally with the soviets.

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The Vietnam War.  The United States feared communist victory, this was feared because of 'the Dominio theory'.  This was thought that if one country fell under communistic influences it would cause a domino effect. This was disastrous for the U.S Military when The Vietnam War broke out. Basically, the Vietnam War created a lot more tension between US and USSR.

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The Strategic Arms Limitation Theory. This created a limit that would be placed on countries determining the number of nuclear weapons that each country could use. A Second Treaty was signed and it created a lot of tension, Soviet Union and Cuba supported communist revolutionarys.

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The Soviet Union was declared to be "the evil empire" by Ronald Reagan. The United States lead a mass boycott and protested becuase of the Soviet Union. The Soviet invasion and the election of Ronald Reagan all spiked these tensions rising in the 80's.

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The Berlin Wall came down, boarders were opening up, and free elections would overpower communist governments in Eastern Europe causing the Cold War to come to an end.

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In 1991 the nationalists movement made up various regions in The Soviet Union. They would go on to destroy the communist system completely. The collapse of communism in The Soviet Union was because of an ideological, political, and economic crisis.

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Although communism in The Soviet Union fell apart, communist governments would still remain in places like China, Cuba, and North Korea.