The U.S. Constitution, ratified in 1788, established the framework for the U.S. government. It outlines the separation of powers among the three branches of government: the legislative, executive, and judicial branches. The Constitution sets forth the principles of federalism, checks and balances, and individual rights, forming the foundation of American democracy. Additionally, it comprises the Bill of Rights, which guarantees fundamental freedoms and protections for citizens. The Constitution has since become a living document, adapting through amendments and interpretations while continuing to guide the nation's governance and legal principles.