Which statement is true about U.S. federalism?

A. State governments are too weak to meet most citizens' needs.
B. State governments are supreme over the national government.
C. National and state governments have clear separation in their policy areas.
D. National and state governments share power in ways that change over time.

National and state governments share power in ways that change over time in U.S. federalism. The division of power between them allows for the national government to handle certain matters like national defense and foreign relations, while states can regulate internal affairs like traffic and environmental laws.

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