What is the principle that divides power between the federal, state, and local government?

Federalism

Federalism is the system of government in which power is divided between a central government and regional governments; in the United States, both the national government and the state governments possess a large measure of sovereignty.

Explanation:

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demand is the need and oportunity to buy a given good or service.

the western roman empire flourished, but the eastern portion of the empire struggled.