The United States federal government is the national governing body of the United States, established by the U.S. Constitution. It consists of three branches: the Legislative, which makes laws; the Executive, which enforces laws; and the Judicial, which interprets laws. This system of checks and balances ensures that no single branch becomes too powerful. The federal government is responsible for a wide range of functions, including national defense, foreign affairs, and regulating interstate commerce. It also administers various programs and services, such as Social Security and Medicare, to support the well-being of its citizens.