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Truman Doctrine: President Harry S. Truman announces a policy to provide economic and military aid to Greece and Turkey to prevent them from falling into the Soviet sphere.

Marshall Plan: Secretary of State George Marshall proposes a plan to provide economic assistance to rebuild Western European economies, aiming to prevent the spread of communism.

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The United States declares the Truman Doctrine, promising support to countries threatened by communism, seen by the Soviet Union as a direct threat to its influence and an aggressive move to contain Soviet expansion.

Link: https://www.britannica.com/event/Truman-Doctrine

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The Soviet Union blocks Western Allies' railway and road access to the sectors of Berlin under Western control. This move was seen as a necessary step to counter Western attempts to create a separate West German state. The Western airlift is perceived as an act of defiance.

Link: https://www.nato.int/cps/en/natohq/declassified_136188.htm

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The establishment of NATO is viewed as a hostile military alliance aimed directly at the Soviet Union and its allies, increasing the sense of encirclement and threat from the West.

Link: https://www.bing.com/ck/a?!&&p=6ede33d8d8da8c51JmltdHM9MTcxNjI0OTYwMCZpZ3VpZD0wYTBmZjg0My04NDcyLTYwYzctMTVjNS1lOTRiODU2YzYxNTQmaW5zaWQ9NTQ4Mg&ptn=3&ver=2&hsh=3&fclid=0a0ff843-8472-60c7-15c5-e94b856c6154&psq=1949%3a+Formation+of+NATO&u=a1aHR0cHM6Ly93d3cuYmJjLmNvLnVrL2JpdGVzaXplL2d1aWRlcy96Znd5Y2RtL3JldmlzaW9uLzY&ntb=1

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The Korean War is seen as a confrontation between the Soviet-supported North and the US-supported South. The Soviet Union provides material support to North Korea, interpreting the conflict as a necessary fight against Western imperialism and a test of communist resilience.

Link: https://www.britannica.com/event/Korean-War

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The death of Stalin marks a period of internal consolidation and reassessment of policies. Nikita Khrushchev’s rise to power initiates a phase of de-Stalinization and attempts to reduce direct confrontation with the West.

Link: https://www.bing.com/ck/a?!&&p=15fa17aebfbe3b70JmltdHM9MTcxNjI0OTYwMCZpZ3VpZD0wYTBmZjg0My04NDcyLTYwYzctMTVjNS1lOTRiODU2YzYxNTQmaW5zaWQ9NTUxNw&ptn=3&ver=2&hsh=3&fclid=0a0ff843-8472-60c7-15c5-e94b856c6154&psq=1953%3a+Death+of+Stalin&u=a1aHR0cHM6Ly93d3cuaGlzdG9yeS5jb20vdGhpcy1kYXktaW4taGlzdG9yeS9qb3NlcGgtc3RhbGluLWRpZXM&ntb=1

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The creation of the Warsaw Pact is a response to NATO, aimed at solidifying the Eastern Bloc under Soviet leadership and ensuring mutual defense against Western aggression.

Link:https://www.bing.com/ck/a?!&&p=0050c07d810481bfJmltdHM9MTcxNjI0OTYwMCZpZ3VpZD0wYTBmZjg0My04NDcyLTYwYzctMTVjNS1lOTRiODU2YzYxNTQmaW5zaWQ9NTQ5Nw&ptn=3&ver=2&hsh=3&fclid=0a0ff843-8472-60c7-15c5-e94b856c6154&psq=1955%3a+Warsaw+Pact+Formation&u=a1aHR0cHM6Ly93d3cuYnJpdGFubmljYS5jb20vZXZlbnQvV2Fyc2F3LVBhY3Q&ntb=1

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The Hungarian Revolution is perceived as a critical threat to Soviet influence in Eastern Europe. The Soviet military intervention to crush the uprising is viewed as essential to maintaining control over its sphere of influence and preventing the spread of counter-revolutionary movements.

Link:https://www.bing.com/ck/a?!&&p=48e68afe9bd1ccdaJmltdHM9MTcxNjI0OTYwMCZpZ3VpZD0wYTBmZjg0My04NDcyLTYwYzctMTVjNS1lOTRiODU2YzYxNTQmaW5zaWQ9NTQ3NA&ptn=3&ver=2&hsh=3&fclid=0a0ff843-8472-60c7-15c5-e94b856c6154&psq=1956%3a+Hungarian+Uprising&u=a1aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvSHVuZ2FyaWFuX1Jldm9sdXRpb25fb2ZfMTk1Ng&ntb=1

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The launch of Sputnik is seen as a major scientific and technological triumph, showcasing Soviet advancements and challenging Western perceptions of Soviet inferiority. It symbolizes the Soviet Union's entry into the space race, heightening Cold War competition.

Link:https://en.wikipedia.org/wiki/Sputnik_1

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The Berlin Crisis, culminating in the construction of the Berlin Wall in 1961, is seen as a necessary action to prevent the mass exodus from East to West Berlin, which threatened the stability.

Link:https://www.bing.com/ck/a?!&&p=bd07816816dc8150JmltdHM9MTcxNjI0OTYwMCZpZ3VpZD0wYTBmZjg0My04NDcyLTYwYzctMTVjNS1lOTRiODU2YzYxNTQmaW5zaWQ9NTQ5MQ&ptn=3&ver=2&hsh=3&fclid=0a0ff843-8472-60c7-15c5-e94b856c6154&psq=1958-1961%3a+Berlin+Crisis&u=a1aHR0cHM6Ly93d3cuZ2NzZWhpc3RvcnkuY29tL2ZhcS9iZXJsaW5jcmlzaXMuaHRtbCM6fjp0ZXh0PUJlcmxpbiUyMENyaXNpcyUyQyUyMDE5NTgtNjElMjBXaGF0JTIwd2FzJTIwdGhlJTIwQmVybGluJTIwQ3Jpc2lzJTNGLHRyb29wcyUyMHdpdGhkcmF3JTIwd2l0aGluJTIwYSUyMHBlcmlvZCUyMG9mJTIwNiUyMG1vbnRocy4&ntb=1

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Berlin Blockade and Airlift: The Soviet Union blocks all ground access to West Berlin. The U.S. and its allies respond with a massive airlift to supply the city.

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NATO Formation: The North Atlantic Treaty Organization is established as a military alliance between the U.S., Canada, and several Western European nations.

Soviet Atomic Bomb: The Soviet Union successfully tests its first atomic bomb, ending the U.S. monopoly on nuclear weapons.

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Korean War Begins: North Korea, backed by the Soviet Union and China, invades South Korea. The U.S. leads a United Nations coalition to defend South Korea.

Source: Youtube Video.

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Hydrogen Bomb: The U.S. successfully tests the first hydrogen bomb, significantly increasing its nuclear capabilities.

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Korean War Armistice: An armistice is signed, ending active combat in the Korean War. Korea remains divided at the 38th parallel.

Stalin's Death: Joseph Stalin dies, leading to a period of uncertainty and a power struggle in the Soviet Union.

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Warsaw Pact: In response to NATO, the Soviet Union and its Eastern Bloc allies form the Warsaw Pact, a collective defense treaty.

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Hungarian Revolution: Hungarians revolt against Soviet control. The U.S. voices strong support for the uprising but does not intervene militarily. The revolt is crushed by Soviet forces.

Suez Crisis: A crisis erupts over control of the Suez Canal. The U.S. pressures the United Kingdom, France, and Israel to withdraw their forces, demonstrating U.S. influence in global affairs.

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Sputnik Launch: The Soviet Union launches Sputnik, the first artificial satellite, initiating the space race and causing alarm in the U.S. about Soviet technological capabilities.

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U-2 Incident: An American U-2 spy plane is shot down over the Soviet Union. The pilot, Francis Gary Powers, is captured, leading to a diplomatic crisis.

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Bay of Pigs Invasion: A failed U.S.-backed attempt by Cuban exiles to overthrow Fidel Castro's communist regime in Cuba.

Berlin Wall: The Soviet-backed East German government constructs the Berlin Wall, physically dividing East and West Berlin and symbolizing Cold War tensions.

First Manned Spaceflight: Soviet cosmonaut Yuri Gagarin becomes the first human to orbit Earth, intensifying the space race.

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Cuban Missile Crisis: The U.S. discovers Soviet nuclear missiles in Cuba, leading to a tense 13-day standoff. President John F. Kennedy imposes a naval blockade on Cuba. The crisis ends when the Soviet Union agrees to remove the missiles in exchange for the U.S. secretly agreeing to remove missiles from Turkey. This is considered the closest the Cold War came to escalating into a full-scale nuclear war.