Federalism
It is called a Federal government as opposed to a Unitary government.
The constitution established a relationship between the state and national governments in the preamble of the constitution. The relationship is called new federalism.
Checks and balances
Federalism
Concurrent Powers
federalism
The division of powers between the national and state governments called federalism. This division of powers is facilitated by the federal government.
In a situation where by power is been divided between center and province is what will called federalism
Federal Government
Its called a treaty
It doesn't quite work that way. The States and their people ARE the government, and they have allowed the Federal government to do a very few things like regulate sales of items between and among the States, provide a military to protect all of the States, and to mint money.
Friendly understanding between governments can be called an accord, entente, or an alliance.