If a nation is very small they could only accept a certain amount of people. They are small so they only have so much food, space, etc. to provide for its citizens. Though if the nation was large such as the US or Canada they can be a little less strict and allow more people in.
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Many people called for him to be impeached.
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I have no clue about this one
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It describes the principle of federalism.
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Reconstruction was the post- civil war era
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