As stated in the United States Constitution; the scope and
mission of the U.S.
federal government includes:
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defense against foreign enemies
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declaring war, military action
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levy taxes, to run the federal government
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levy tariffs
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pay debts of the U.S.
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standardization of bankruptcies
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issue patents
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stewardship of the Constitution, in partnership with states
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foreign affairs
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treaties
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federal judiciary (courts)
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production of money
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regulate interstate commerce
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rules for "naturalization" of new citizens
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standards of weights & measures
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make & enforce "necessary and proper" laws for execution
of federal powers