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The United States Constitution, ratified in 1788 and operational since 1789, is the supreme law of the U.S. and the world's oldest surviving written charter of government. It establishes a federal republic, separating power among three branches—legislative (Congress), executive (President), and judicial (Supreme Court)—and balances power between federal and state governments. [1, 2, 3, 4]Core StructurePreamble: Sets the purpose of the Constitution, beginning with "We the People".Articles: Seven articles define the government's structure:Article I: Creates Congress, defining its powers and structure.Article II: Creates the executive branch (President).Article III: Establishes the Supreme Court and judiciary.Article IV: Outlines the roles and relationships of the states.Article V: Defines the amendment process.Article VI: Establishes the Constitution as the "supreme law of the land".Article VII: Details the ratification process. [1, 2, 3, 4, 5]AmendmentsThere are currently 27 amendments.Bill of Rights (Amendments 1–10): Ratified in 1791, these guarantee essential rights and freedoms, including speech, religion, and the right to bear arms.Amendments 11–27: Include changes like the abolition of slavery, voting rights, and presidential term limits. [1, 2, 3, 4]Key ConceptsLimited Government: The federal government only holds the powers specifically granted to it.Separation of Powers & Checks and Balances: No single branch can gain too much power.Federalism: Power is shared between state and federal governments. [1, 2, 3]HistoryWritten in 1787 at the Constitutional Convention in Philadelphia to replace the weak Articles of Confederation.It serves as the foundation of American law and government, with all laws required to adhere to its principles. [1, 2, 3]For a closer look, you can explore the Constitution through the National Archives or the interactive Constitution Center. [1, 2, 3]