The doctrine by which state and national authority was separated precisely is known as Federalism.
The U.S. Constitution instead of placing authority in the hands of one person, like a king, or even a small group of people, divides power. Power is first divided between the national, state and local government under a system known as Federalism.
In Federalism, the government's power is divided between the national government and other governmental units. The doctrine through which state and national authority is separated is precisely is known as Federalism.
Throughout the 20th century it was seen that the power of the federal government expanded considerably through legislation and court decisions.
Hence, the doctrine of Federalism separated state and national authority.
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