Final answer:
Federalism in the U.S. government ensures federal law supremacy over state laws and allows courts to review laws for constitutionality.
Explanation:
Federalism in the U.S. government revolves around the coexistence of national and state court systems, each with distinct powers. The concept of federalism ensures that in cases of conflict between federal and state laws, federal law prevails, as stated in the Supremacy Clause of the Constitution. Additionally, judicial review by federal and state courts allows them to declare laws unconstitutional if they violate the U.S. Constitution.
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