In the united states, which level of government has the highest authority?

state

county

city

national

National. Because it applies to all, hope this helped

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In the United States, the national level of government has the highest authority.

The federal government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the U.S. Constitution in the Congress, the President, and the federal courts, including the Supreme Court, respectively.