Which amendment addresses the powers reserved to the states?

The Tenth Amendment specifically addresses powers reserved to the states. It was ratified as part of the Bill of Rights in 1791 and explicitly states that the powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people. This amendment emphasizes the principle of federalism, which is foundational to the structure of American government. It ensures that states retain a significant degree of autonomy and authority to govern themselves in areas not specifically managed by the federal government. Therefore, the Tenth Amendment is fundamental in delineating the balance of power between the federal and state governments, reinforcing the idea that states have their own rights unless explicitly limited by federal law or the Constitution itself.