Answer:
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.
Federalism is the system of government in which sovereignty is constitutionally divided between a central governing authority and constituent political units. It is based upon democratic rules and institutions in which the power to govern is shared between national and state governments, creating a federation