Which document outlines the rights of the states?

The Constitution outlines the rights and responsibilities of both the federal and state governments, serving as the foundational legal document of the United States. Specifically, the Tenth Amendment of the Constitution emphasizes the powers that are reserved to the states and the people, stating that any powers not delegated to the federal government are reserved for the states.

While the Articles of Confederation did grant some rights to states, they were largely ineffective in balancing power between the states and the federal government. The Federalist Papers were a collection of essays promoting the ratification of the Constitution, but they do not serve as a governing document themselves. The Bill of Rights primarily details individual rights and freedoms guaranteed to citizens, rather than specifying the rights of states. Thus, the Constitution stands as the most tangible source detailing the rights of the states within the framework of the U.S. government.