In the United States, the Constitution created a federal system of government. The federal system is a decentralized one. It divides the power of governance between a federal government and various state governments.
The Constitution bequeaths the status of "dual sovereignty" to both the federal and state governments. The Tenth Amendment essentially defines how power is balanced between the federal and state governments in the United States. It proclaims that the federal government is constrained by its enumerated powers in the Constitution. It cannot overstep those boundaries. Thus, any powers not assigned to it are retained by the states.
The federal government oversees matters of national concern, while the state governments address local issues. The Constitution allows the federal government (through Congress) to print money, levy taxes, declare war, and regulate interstate commerce. In matters of national security or the national defense, the federal government has jurisdiction. State governments, however, can determine how each state addresses local issues.
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