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Vladimir Ilyich Lenin dies. After exiling his chief rival, Trotsky, Stalin rises to power, despite Lenin's wish that Stalin not succeed him.
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This instigates the years of forced collectivization; millions lose their property.
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Murder of Sergei Mironovich Kirov, Communist party boss in Leningrad. This launches a massive investigation and purge of the Communist Party, replete with show trials and mysterious deaths.
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Some 800,000 people are arrested, imprisoned, and/or executed.
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Stalin signs a non-agression pact with Germany, dividing most of Europe into spheres of influence for the USSR and Germany. Hitler breaks this pact in 1941.
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Hitler commits suicide; war is effectively over.
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Stalin dies.