Because the soviets had previously signed a Non-Aggression pact with Germany and didn't expect the attack from Hitler (A.K.A Germany.)
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The main cause was the Stock Market Crash of 1929.
They created the number system and discovered that the earth was round by studying eclipses.
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Answer: Weakness and Type
Explanation:
For weakness's it couldnt secure funding, no army, and couldnt create common laws. It was a Confederation/Confederacy for type of government
