How did the authoritarian and dictatorial regimes that gained power in the years after world war 1 acquire and maintain their power?

churchill warned that the soviet union had cut eastern europe off from the west with an "iron curtain."

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although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.