Which event played the greatest role in establishing the supremacy of the national government over the states? a) the american revolution b) manifest destiny c) the civil war d) the new deal

C) the Civil War

Explanation: The Civil War was largely fought over states rights, the South felt that the executive branch was taking to much power from the states by trying to take away their property (slaves) and business (export tariff on cotton, harmed the South economy). When the South lost the war, it ultimately proved that the national goverment had supremacy over the states

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