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The Yalta conference was a wartime meeting between Winston Churchill, Joseph Stalin, and Franklin Roosevelt. All the leaders agreed to demand unconditional surrender from Germany. With the surrender of Germany, they also agreed to split Grmany between there countries and France. Stalin agreed to allow free elections in Eastern Europe.
The Yalta conference became controversial after Stalin broke his promise of free elections in Eastern Europe and many people said that Roosevelt "sold out " the Soviets.
This Event and its aftermath is primarily the Soviet union's fault because they broke the promises of having free elections Eastern Europe which led to a breakdown of trust between the US and the Soviet Union. It is partly the US's fault because it caused many anti-Americans to say that the US and Roosevelt sold out the Soviet Union.

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The Truman Doctrine established that the US would give foreign aid to countries in need of support. This Doctrine was created to help countries who were close to becoming communist or who were fighting communism. The Truman Doctrine arose when Truman learned that the British government could no longer support the Greek government in their struggle against communism.
This event and its aftermath were the US's responsibility because the doctrine was created by the US and intended to help nations fight communism and prevent communism from spreading.

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The Marshall Plan supported Europe by giving them 13 billion to fund the recovery of Europe. The Soviet Union disliked the plan, but it succeeded in helping Europe recover and progress towards a stable economy.
This was primarily the US's responsibility because the Soviet Union viewed this as intervening in internal affairs of other countries. The Soviet Union was also partly responsible for some conflict because they prevented Poland from participating despite their eagerness to do so.

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The Korean War was when North Korea invaded South Korea. North Korea was backed by China and the Soviet Union. South Korea was backed by the United States. This war was considered a war against communism because North Korea and their allies were for communism and South Korea and the US were against it. The US believed that if South Korea were defeated communism would spread.
This War was primarily the Soviet union's responsibility because they backed North Korea who started the war and wanted the spread of communism. It was partly the US's responsibility because they supported South Korea and their attempt to stop the spread of communism into South Korea.

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The Vietnam War was between North Vietnam and their Southern allies Viet Cong and South Vietnam and their allies the United States. This was also a war against communism that started after Ho Chi Minh, and his communist party rose to power in the mid-1940s. The US agreed to help South Vietnam by providing military and police support. In March of 1965, the US decided to send military troops in for a full on battle.
This war was mostly the Soviet union's responsibility because they were trying to push to spread communism by backing North Vietnam. The US was partly responsible because they stepped in to support South Vietnam by providing troops and supplies in an effort to stop the communist expansion.

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Sputnik was the first satellite launched into space. The satellite was launched by the Soviets. This launch started the beginning of the "Space Race" since the Soviets satellite was far ahead of US efforts by a year. The satellite weighed 184 pounds and orbited the earth every hour and 36 minutes.
This event was only the Soviet union's responsibility because it was there satellite and the aftermath of American paranoia was caused by the launching of the Soviet satellite.

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An American U-2 Spy Plane was shot down over Soviet territory as it was on a spy mission on the Soviets. This incident canceled an important meeting between the US and the Soviets that was scheduled soon. This Incident created higher tension between the US and the Soviet Union.
This incident was the US's fault because it caused the cancellation of an upcoming important meetings by angering the Soviet Union because of the secret operation.

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After Fidel Castro had overthrown the leader in Havana Cuba, the CIA attempted to push Castro from power for two years, when that failed the CIA launched a full invasion that the CIA believed would push him from power. This invasion was fought by 1400 American trained Cubans. The invaders were heavily outnumbered and surrendered after fighting no more than 24 hours.
This was primarily the US's fault because they decided to attempt to overthrow Castro and therefor to provoke Castro and his supporters the Soviet Union. This was partly the Soviet union's fault because they backed Castro and his overthrow of the previous Cuban government.

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Cuban Missile Crisis (October 16th 1962)

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Cuban Missile Crisis (October 16th 1962)

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The Cuban missile crisis was a 13-day military and political standoff with the Soviet Union and the US. This standoff was about the Soviet Unions nuclear missiles in Cuba. This was a huge conflict because the missiles were just 90 miles from the US and could be launched in minutes. This crisis sent the US into panic as Kenedy tried to defuse the situation. This crisis was averted by striking a deal for the US not to invade Cuba, and then the Soviet Union would in return remove the missiles from Cuba.
This was mostly the Soviet Unions fault because they placed the missiles in Cuba and by doing that provoked the United States by having the missiles that close. It was partly the US's fault because of the pushback from the US and their threat to invade Cuba.