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The plague had an important effect on the relationship between the lords who owned much of the land in Europe and the peasants who worked for the lords.
All immigrants coming into the US had to stop at ether of those places to be allowed into the US
In the early 1900s, Russia was one of the most impoverished countries in Europe with an enormous peasantry and a growing minority of poor industrial workers. ... The emancipation of serfs would influence the events leading up to the Russian Revolution by giving peasants more freedom to organize.
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I dont understand your question