The Tenth Amendment is part of the United States Constitution, ratified in 1791. It states that powers not delegated to the federal government, nor prohibited to the states, are reserved for the states or the people. This amendment emphasizes the principle of federalism, ensuring that states retain certain powers and authority. By reinforcing state sovereignty, the Tenth Amendment limits the scope of federal power. It plays a crucial role in the balance of power between the federal government and the states, allowing states to govern themselves in areas not specifically addressed by the Constitution, such as education and local law enforcement.