The national government is obligated to support the state governments in case of an emergency in that state. The national government also should no infringe on state powers.
It divides power between a National Government and State governments. The obligation of the National Government to protect the States against invasion.
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It is, in fact, under Article IV Section IV Clause I, and the answer is:
"The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion"
There are so many things that the national government provides to states. The main provision is funds that are devolved to the states for purposes of development.
A federalist pamphleteer
The United States requires that all the states governments should have a republican form of government. The republican governments that is instituted by the state governments must be on the basis of the national union.
The national government is obligated to support the state governments in case of an emergency in that state. The national government also should no infringe on state powers.It divides power between a National Government and State governments. The obligation of the National Government to protect the States against invasion.
The federal government controls foreign affairs because the country must one policy in dealing with other countries. The states control education and marriage because the Constitution gives the states the freedom to regulate in areas that the federal government does.
Federalism is never explicitly stated but it is embedded in the US constitution. As a result, power is kept in the states.