The United States is made up of 50 sovereign states. Each state has its own government and constitution, but they are all united under the federal government of the United States.
In addition to the 50 states, the U.S. also has several territories, but these territories do not have the same sovereign status as the states. The states are recognized as full members of the union, participating directly in the political process and having representation in Congress. This structure allows for a division of powers between state and federal authorities, reflecting the principles of federalism on which the country was founded.