What major step toward centralization of economic power in the hands of the federal government took place during the Civil War?

Question

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The Civil War led to the creation of a national currency, which was a significant step toward centralizing economic power in the hands of the federal government. This move helped to standardize the currency across the country and reduce the reliance on a multitude of state and private bank-issued currencies.

What Major Step Toward Centralization of Economic Power in the Hands