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The Yalta Conference is held and the Cold War officially begins.
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Winston Churchill delivers the Iron Curtain Speech
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Berlin gets blockaded by the Soviet Union to try to starve them.
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The North Atlantic Treaty Organization is ratified, earlier Berlin is also freed from its blockade
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The Korean War begins.
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Construction of Berlin Wall begins as Berlin borders are closed
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Berlin Wall falls after Soviets give up on attacking East Berlin
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The Soviet Union falls and officially causes the end of the Cold War