what kind of government is the united states under the constitution

The United States is a federal democratic republic form of government, as established by the Constitution of the United States. The Constitution is the "supreme law of the land" and no law may be passed that contradicts its principles. The government is based on three main principles: inherent rights, self-government, and separation of powers. The Federal Government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the U.S. Constitution in the Congress, the President, and the Federal courts, respectively. The United States is also a constitutional federal republic, meaning that the government is based on a Constitution which is the supreme law of the United States, and there is both a national government and governments of the 50 states.