The Alien and Sedition Acts helped the Federalist Party control national politics in the following TWO ways:
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by making it harder for immigrants to participate in the political process - The Acts targeted immigrants, who tended to support the Democratic-Republican Party, making it more difficult for them to gain citizenship and vote.
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by restricting people's ability to criticize the government - The Sedition Act specifically limited freedom of speech by making it illegal to criticize the government, helping to suppress opposition to the Federalist Party.