A principal reason that the federal government's importance in regulating commerce increased in the twentieth century was that economic activity had become more national, making the distinction between interstate and intrastate commerce more difficult to sustain.

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As economic activity became more national in the twentieth century, it became increasingly difficult to distinguish between interstate and intrastate commerce, which led to an increase in the federal government's importance in regulating commerce.

A Principal Reason That the Federal Government's Importance in Regulating