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  - Stalin was the leader of the Soviet Union for a quarter of a century.
- He forced the collectivization of agriculture which cost millions of lives.
- The population of the Soviet Union suffered because of the Great Terror of the 1930s.
 
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  - The Hitler-Stalin Pact was a non-aggression pact to keep Germany from fighting on two fronts.
- The pact did not keep them from fighting, but it helped Hitler in the war.
- They agreed to split Poland, half to Russia half to Germany.
 
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  - German and Soviet army elements finally meet one another in Poland at Brest-Litovsk.
 
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  Soviet Union and Japan sign a non-aggression pact
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  - German codename for the invasion of the USSR
 
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  - The siege of Leningrad was an attack on Leningrad by German forces.
- It took 872 days for the USSR to regain it.
- Capturing it was one of the three main goals of Operation Barbarossa.
 
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  - The battle of Stalingrad was considered a turning point of World War II.
- It was fought between 1942 and 1943 in Russia.
- It was considered one of the most brutal wars.
 
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  - The potsdam conference is held between the Us, the ussr, and the united kingdom to decide nazi germanys punishment
 
