Politics of the United States

In the United States, politics functions within a framework of a constitutional federal republic with a presidential system. The three distinct branches share powers: Congress, which forms the legislative branch, a bicameral legislative body comprising the House of Representatives and the Senate; the executive branch, which is headed by the president of the United States, who serves as the country's head of state and government; and the judicial branch, composed of the Supreme Court and lower federal courts, and which exercises judicial power.

Source: Wikipedia — Politics of the United States (CC BY-SA 4.0)