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Summary
Vietnam was divided after World War II into North Vietnam, which was under the control of Ho and his communist forces, and South Vietnam. The U.S. believed that the fall of South Vietnam would trigger a sort of domino effect which would allow the spread of communism across Southeast Asia. Therefore, they offered support to the anti-communist politician Ngo Dinh Diem. However in 1963, the U.S. organized a coup to overthrow him because his regime was corrupt and unpopular. Lyndon B. Johnson was then elected president and although he wanted to keep American U.S. involvement to a minimum, there ended up being 400,000 troops in Vietnam by the end of 1966. Vietnam's guerrilla tactics frustrated and demoralized U.S. troops so they used unconventional weapons to push the Vietnam troops away. President Nixon stepped up the bombing of North Vietnam until a cease fire was finally signed in 1973. However, after the Watergate Scandal and Nixon resigned, the South Vietnamese capital fell to the North and the country was reunited under communist rule and the Vietnam War finally ended in 1975.
Who Was to Blame?
The U.S. deserves 60% of the blame while the Soviet Union deserves 40% of the blame. This is because the U.S. did not need to help South Vietnam but did to further their own agenda and to stop the spread of communism. However, the Soviet Union also did not have to support the attack on North Vietnam as it was unnecessary and they only did it to gain more control in Southeast Asia. However, the majority of the blame goes to the U.S. because they basically controlled what happened in South Vietnam to fight against the Soviet Union which increased the tensions between the two countries.
Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 9

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Summary
The Soviet Union became the first nation to have a human in space when on April 12, 1961 Yuri A. Gagarin went into space for the first time.  The U.S. took this as a challenge and such decided that they would be the first nation to send a man to the moon. A month after the Soviet Union sent a man into space, the U.S. duplicated the same feat. Seven years later, Neil Armstrong arrived on the moon. The space program made universities expand their science program and gave rise to new industries and technologies such as the space defense industry which grew rapidly in the Southern and Western states.
Who Was to Blame?
Most of the blame for the increased tensions between the two nations during the space race goes to the United States. They did not need to see the expansion into space as race nor as a challenge. Making it a race made the relationship between the two superpowers more tense and although it led to better technology, it did not help end the Cold War.
Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 6

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Summary
3 million Germans had fled into West Berlin because of the failure of East Germany's Communist government. Khrushchev, the Soviet Premier of the Soviet Union, threatened to cut off all access roads to West Berlin with East Germany. The U.S. was against this and refused to give up access. As a result, Khrushchev built the Berlin Wall, separating East Germany from West Germany. This wall reduced the flow of East German refugees, but became a symbol of communist oppression.
Who Was to Blame?
The majority of the blame lies with the Soviet Union. The only reason people were fleeing from Germany was because of the failed Communist government. If the Soviet Union had done a good job of governing the people, they wouldn't have the problem of people fleeing. The United States did the right thing by deciding to not to isolate West Berlin. Obviously they could have conceded to the Soviet Union, but that would have meant abandoning all the people in West Berlin who would then have difficulty surviving if all their access roads were blocked.
Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 7

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Summary
The flow of Soviet weapons to Cuba increased during the summer of 1962. On October 14th photos were taken that showed Soviet missile bases in Cuba and some missiles ready to launch. Kennedy then informed the U.S. of the existence of nuclear weapons in Cuba and made it clear that any attack would trigger an attack on the Soviet Union. The crisis ended when Soviet ships were intercepted and the Soviet Premier, Khrushchev and the U.S president, Kennedy made a deal. Khrushchev removed the missiles in return for an American pledge not to invade Cuba and Kennedy also secretly promised to remove missiles from Turkey.
Who Was to Blame?
The U.S. and the Soviet Union both hold 50% of the blame. The leaders of both of these countries could have done things differently so that the anxiousness that was felt by the world did not have to occur. For example, Kennedy could have had private talks with the Soviet Union instead of announcing the missile crisis publicly. He also had his own missiles in countries like Turkey. Khrushchev also did not need to include nuclear missiles when sending protection to Cuba. The power of nuclear weapons did not need to be harnessed and the crisis would not have happened if the threat of nuclear weapons were involved.
Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 8

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Summary
The CIA trained Cuban exiles under the direction of Eisenhower for an invasion of Cuba in hopes of triggering an uprising that would overthrow Castro. Kennedy learned of the plan and had doubts, but he approved it. On April 17, 1961, the Cuban exiles landed in the Bay of Pigs. Nothing worked out to plan however as an air strike didn't knock out the Cuban air force and the advance group never landed. When the exiles reached the shore, they faced overwhelming numbers from both the Cuban and Soviet Union army.  They were defeated easily and the exiles were killed and imprisoned. In the end, Kennedy negotiated with Castro and paid a ransom of 53 million for the release of the exiles. Kennedy warned that he would resist Communist expansion, but Castro still welcomed Soviet aid.
Who Was to Blame?
The U.S. deserves 80% of the blame while the Soviet Union deserves 20% of the blame. Unlike the Korean War, this time the U.S. started the fight. There was no need to invade Cuba the U.S. just wanted to overthrow Castro and stop the spread of communism. It wasn't necessary for them to attack Cuba. The Soviet Union deserves some blame because they did not need to provide aid to Cuba yet they did to support communism.
Graph( (Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 7

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Summary
After World War II, Korea was separated into two nations, one communist and one democratic. The Soviets occupied North Korea while the United States occupied South Korea. The U.S. cut back on its troops, so North Korea decided to launch a surprise attack on South Korea on June 25, 1950 in an attempt to take over the entire peninsula which consequently started the Korean War. Soon after, the UN decided to vote on military action and it was passed because the Soviet Union was not there to veto the vote. The United States fought back and pushed the North Korean troops to the border between North Korea and China. However, China did not want the Americans to come to the border and thus fought back and by sheer strength of numbers was able to push the American troops back. Then there was a standoff where no one side could make any advances. General MacArthur, the commander of the U.S. troops, recommend to Truman to attack China, however Truman disagreed with him and MacArthur was later fired. The Korean War ended when the Soviet Union suggested a cease-fire and the two sides signed an armistice ending the war in July, 1953. Korea was still divided into two nations and nothing much had changed.
Who Was to Blame?
The Soviet Union holds 70% percent of the blame while the U.S. holds 30% of the blame. This is because the Soviet Union was the nation who first started the conflict. If they didn't decide to invade South Korea, the U.S. and U.N. wouldn't needed to have intervened and increased the tensions between the two superpowers. Of course the U.S. could have just let the Soviet Union invade South Korea, but South Korea went to the U.N. for help so the U.S. was obligated to fight especially because they had the resources necessary to do so. The Soviet Union also could have vetoed the plan of action, however they did not show up to the meeting so it was also partly their own fault for the fight that occurred.

Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 9

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Summary
Western Europe was in chaos as millions were living in refugee camps  while the cold weather made it even more difficult to survive. As a result, Secretary of State George Marshall decided to enact the Marshall Plan to combat "hunger, poverty, desperation, and chaos". This plan gave 13 billion dollars in aid to 16 countries over the next four years and helped Western Europe to flourish once again. This lead to a decrease in faith of the Communist party and its effectiveness.
Who Was to Blame?
90% of the blame goes to the Soviet Union while 10% of the blame goes to the United States. This is because it was the Soviet Union's fault for the failure of the Communist regime in Western Europe. This time, unlike the Truman Doctrine, the U.S. did not intervene because they wanted to stop the spread of communism. Instead, they intervened because they saw the difficulties people were facing and wanted to help. Of course, they could have decided not to help, but that would have been inhumane especially because they had the resources needed to give help. If the Soviet Union had implemented a more effective regime, the U.S. would not have felt the need to intervene and tensions would not have risen.

Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 4

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Summary
Truman asked Congress for 400 million to aid Greece and Turkey who were resisting the growing communist influence in that region. The Truman Doctrine was a statement made by Truman who justified his actions by saying it was "the policy of the United States to support free peoples who are resisting attempted subjugation by armed minorities or by outside pressures". The U.S. used the money to to reduce the Soviet influence from spreading which increased the tensions between the two nations.
Who Was to Blame?
Both the United States and the Soviet Union was to blame for this event. The United States didn't need to intervene with the affairs of the Soviet Union. They don't have the responsibility to decide when to send help to other countries. The United States government also does not know whether or not the spread of communism is going to have a negative affect. On the other hand, the Soviet Union did not need to spread communism in their region. They knew that the U.S. supported democracy and would probably resist their expansion but did it anyways. Thus, both parties are responsible in this event for the hostilities it created.

Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 5

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Summary
The Yalta Conference was a meeting between Roosevelt, Churchill, and Stalin in the city of Yalta in the Soviet Union. They celebrated the defeat of Germany and also discussed the fate of Germany. Stalin wanted to keep Germany divided but Churchill didn't agree so Roosevelt acted as the mediator. In the end, Germany was divided into four zones and as a result, Stalin agreed to join in the war with Japan and also agreed to participate in an international conference which would lead to the eventual creation of the United Nations. Stalin also promised free elections in Poland and other Soviet-occupied European countries.
Who Was to Blame?
No one was to blame for this occurrence. The Yalta Conference was a peace conference to discuss what was going to happen after World War II. Roosevelt tried his best to satisfy both Churchill and Stalin while completing his own goals. There was no hostile environment at this time although the decisions made by the three leaders would affect what happened in the Cold War.

Graph(Red represents the Soviet Union, Blue represents the United States):
Importance(out of ten): 3