The constitution divides power horizontally between the national government and the state governments. what is this arrangement called?

Federalism

Explanation:

Federalism is refereed to as the political organization in which there is a division of power between national government and other governmental units. It helps the state government and national government to reach an agreement between them over their excursive and concurrent powers. However, it should be noted here that over time, the balance of power between the two levels of government according to the changed social needs.

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