Which type of government system is practiced by the US? Unitary Confederal Dictatorship Federal

The United States practices a federal system of government. In a federal system, power is divided between a central (national) government and individual state governments. Each level of government has sovereignty in some areas and shares powers in other areas. This division of powers is typically established in a constitution. The U.S. Constitution, for example, outlines the powers of the federal government and reserves all other powers to the states or the people. This system allows for a balance of power and ensures that no single entity has complete control over the country.