Final answer:
The U.S. Supreme Court affirms the national level of government as supreme when ruling a state law unconstitutional.
Explanation:
When the U.S. Supreme Court rules that a state law is unconstitutional, it is affirming the national level of government as supreme. This is because the U.S. Supreme Court has the final authority on interpreting the U.S. Constitution and national law, making its decisions supreme over state laws. For example, in the case of Martin v. Hunter's Lessee in 1816, the U.S. Supreme Court ruled that state courts must adhere to its decisions on federal questions, establishing federal supremacy.
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