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Descr: August 6 1945 the U.S. dropped little boy to Hiroshima, Japan. August 9, 1945 fat boy was dropped to Nagasaki, Japan.

Sig: It was the 1st a-bomb to be used. This sparked a reaction to why the U.S. bombed 2 cities in Japan and a concern for radioactive activity afterwards. This could be the start of the Soviet Union and the U.S. to start a race between who could make the most nuclear bombs and most powerful.

Relation to Truman Doctrine: The bombings of Hiroshima and Nagasaki could be a show that the U.S. was not going to allow the USSR to keep expanding itself to other nations.

Type of Event: Military and social

Diagram: 129,000-226,000 people killed.

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Description: On March 12, 1947, President Truman signed the Truman Doctrine which established that the U.S. would provide political, military and economic help to all democratic nations that were in any external threats.

Sig: With the Truman Doctrine being signed it caused tension between communist nations and capitalist nations. It had left the world divided. It showed the U.S. would help countries that were being attacked by the USSR like Greece.

Relation to NATO: With the Truman Doctrine being signed, and 2 years later the formation of NATO it had proved that the U.S. would stop the spread of communism by aiding other countries who were under attack of being influenced by the Soviets.

Type of event: Political, military and Social

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Description: In April 4, 1949 NATO was formed. NATO was formed with the following countries: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the UK, and the U.S. The purpose of NATO is to provide military aid through its alliances.

Sig: NATO being established had made the Soviet Union feel backed up into a corner since the U.S. had gathered alliances to fight the USSR. This had created more tension between the 2 nations over capitalist countries providing security from communism.

Relation to Russia's 1st N-bomb test: The creation of NATO could be a reason as to why the USSR had created its 1st a-bomb test. This could be showing NATO that the Soviet Union was also going to aid itself against NATO by creating a-bombs.

Type of Event: Political and social

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Description: In August 29, 1949 the USSR tested their 1st A-Bomb in Kazakhstan(Russia). RDS-1 was the Soviet Union's 1st atomic bomb created, which soon followed with creating more a-bombs.

Sig: The RDS-1 proved that the USSR was able to make atomic bombs in order to show that they could use their nuclear weapons. This would be a start of creating more nuclear bombs to show which country had the most powerful a-bomb.

Relation to H-Bomb approved: The RDS-1 being tested had made President Truman approve the production of producing hydrogen bombs. The U.S. wanted show its strength in creating weapons to fight against the USSR.

Type of event: Military and social

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Truman Approves H-bomb development (1950)

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Truman Approves H-bomb development (1950)

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Description: In January 30, 1950 President Truman approved the H-bomb development. The hydrogen bomb development would allow the U.S. to start a project on creating h-bombs.

Sig: The approval of the h-bomb had made expert worried due to the fact that a hydrogen bomb would be more powerful than the already established atomic bombs. This was in response to the Soviets testing their first a-bomb.

Relation to USSR 1st A-bomb test: With the USSR testing the RDS-1 it had led the U.S. to make an even more powerful weapon. The H-bomb was a show to make the Soviets scared that the U.S. could develop such a powerful weapon.

Type of event: Social and military

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Description: On October 4, 1957 in Tyuratam, Kazakhstan(Russia) the Soviet Union launched the first space satellite named the Sputnik. It was the first object to be launched into space.

Sig: This was the beginning of the Space race. This showed a strength in which the Soviet wanted to dominate the field of the space world. This was the first satellite to go into space and orbit the Earth.

Relation to Explorer I: The Sputnik being launched made the U.S. also want to launch something into space. The Explorer I was launched a year later to compete in the space race.

Type of event: Social

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Description: On January 31, 1958, the Explorer I was launched into space. It was a modified Red-stone ballistic missile. It was able to orbit around the Earth. This was the beginning of the space race.

Sig: The U.S. launched the Explorer I which started the space race between the U.S. and the Soviet Union. This was a response to the Sputnik I and II launched by the Soviet Union.

Relation to Sputnik: The Sputnik was launched a year before in which the U.S. responded by sending their own object into space. This was the beginning of the U.S. Space age to start dominating the space world against the USSR.

Type of event: Social

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Description: On April 17-20 1961 was a failed military invasion into Cuba to overthrow the current communist leader Fidel Castro. The Cuban Democratic Revolutionary Front(DRF) wanted to remove Fidel Castro which was financed by the U.S.

Sig: The failure of the Bay of Pigs Invasion had allowed Fidel Castro to stay in place to rule Cuba. The efforts of the U.S. to remove communism in Cuba had failed which was an embarrassing moment for the U.S. This showed a strength between Fidel Castro and the Soviet Union.

Relation to Cuban Missile Crisis: The failed Bay of Pigs Invasion allowed the Soviet Union to place missiles in Cuba which began the Cuban Missile Crisis.

Type of event: Military and political

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Description: On October 16-29, 1962 there was a 13 day confrontation between the Soviet Union and the U.S. where it was the closest the world would ever become to having a nuclear war. Khrushchev had ordered for nuclear missiles to be in Cuba.

Sig: The placement of the nuclear missiles being placed right near the U.S. had made the U.S. in need of getting rid of those missiles. Khrushchev had placed the missiles in Cuba as a show for protection against the U.S. Another reason is due to the fact that a year earlier the U.S. had placed nuclear missiles in Turkey which were in close range to the Soviets.

Relation to Bay of Pigs: The Cuban Missile Crisis relates to the Bay of Pigs in the sense that the Soviets wanted to show that they would protect Fidel Castro from the U.S. The failed attempts to remove Fidel and him agreeing to the missiles being placed in Cuba had strengthen the relationship between the USSR and Fidel.

Type of event: Military

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Description: On August 5, 1963, the Soviet Union, U.S. and the UK signed the Nuclear Test Ban Treaty. This treaty banned all tests of nuclear weapons except those conducted underground.

Sig: This would be a step into reducing the amount of nuclear weapons being tested from all parties. This would stop any nuclear weapon from being tested and causing harm to the planet. It also showed the USSR and U.S. would be willing to work together in an important manner.

Relation to CMC: The Cuban Missile Crisis had shown that the U.S. or the Soviet Union was not ready to handle a nuclear war. The CMC was a moment where the 2 superpowers were close to having a nuclear war. With this treaty being signed it showed that both nations would not come close to a conflict like this.

Type of event: Social, military, and political

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Description: On May 26, 1972, SALT I signed into place. Strategic Arms Limitation Talks(SALT) I was an agreement between the U.S. and the USSR to limit the number of ballistic missiles and number of missile deployment sites.

Sig: By signing SALT I it was another show that the USSR and the US were willing to work together to limit the use of nuclear weapons and tests/test sites. It would restrain the US and the Soviet Union from using missiles.

Relation to Nuclear Test Ban Treaty: SALT I was another treaty that had limited the amount of weapons the both nations would use. It would prevent them from testing nuclear weapons and also limit the amount of ballistic missiles created.

Type of event: Social, military, and political

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Description: On November 9, 1989, the Berlin Wall fall which reunited West and East Berlin back together. During the Peaceful Revolution the fall of the Berlin Wall happened, this marked a significant moment in the Cold War.

Sig: It was the 1st step to get Germany back reunited after being separated, West and East Berlin. This would reunite Germany in 1990 being a big step of "ending" the Cold war. The Berlin wall was often referred to as the "Iron Curtain" which is what divided democracy(West Berlin) into communism(East Berlin). With the fall of the Berlin wall it was a step closer to the USSR dissolving in 1991.

Relates to SALT I: With the signing of SALT I and II it was a big moment for the 2 nations to realize that spending so much money on nuclear weapons was not sustainable, which was one of the downfalls to the Soviet Union. The fall of the Berlin wall was another reason for the USSR to collapse as East Berlin was reunited with West Berlin.

Type of event: Social