How did the outcome of the civil war change federalism, so that it became nation-centered rather than state-centered?

Federalism in the United States is the constitutional division of power between U.S. state governments and the federal government of the United States. Since the founding of the country, and particularly with the end of the American Civil War, power shifted away from the states and towards the national government. The progression of federalism includes dual, state-centered, and new federalism.

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i think u are supposed to write a long-essay answers to the long-essay questions