The Constitution of the United States outlines the foundational principles of the U.S. government. Ratified in 1788, this document establishes the framework for the federal government, delineating the powers and responsibilities of the three branches: the legislative, executive, and judicial systems. It also includes the Bill of Rights, which guarantees individual liberties and rights to citizens. The Constitution serves as the supreme law of the land, guiding legislation, governance, and the protection of democracy, while also allowing for amendments to adapt to changing societal needs.