Sovereignty - The absolute and supreme power and authority to exercise and enforce one's will. In government, it is the independent authority of the state to act on behalf of its own people. For the individual, it is the right of conscience, the right of self-determination, and the freedom to live without undue interference. In our American system of government, the people, collectively, are the ultimate sovereign over the states, and the states are sovereign over the federal government. Therefore, the federal government serves the states, and the states serve the people.