Primary sourceDocument17 September 1787

United States Constitution

Constitutional Convention · 17 September 1787

The founding charter of the U.S. federal government, drafted at the 1787 Constitutional Convention where Madison played a leading role.

Madison shaped the Constitution's ideas and structure more than any other delegate, earning him the title 'Father of the Constitution.'

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Photograph of the original parchment of the United States Constitution. The large handwritten text begins with the words 'We the People' in ornate script, followed by the article headings and dense lines of brown-ink writing on aged, yellowed parchment. — United States Constitution, signed 17 September 1787. U.S. National Archives.

About this source

What it is

This four-page parchment document was drafted in secret by delegates to the Constitutional Convention in Philadelphia and signed on September 17, 1787. It established the structure of the U.S. federal government and is now held at the U.S. National Archives.

Why it matters

The Constitution replaced the weaker Articles of Confederation and set up the legislative, executive, and judicial branches with checks and balances. James Madison contributed more to its drafting and ideas than any other delegate, earning him the nickname 'Father of the Constitution.' The document reflects compromises among many Founders over how much power the national government should hold.

Look closer

Why do you think the delegates debated in secret?
What compromises can you spot in how representation is described?
What does the formal, careful handwriting tell you about how seriously the document was treated?

This document is part of the curated material that grounds the AI version of James Madison, George Washington, Benjamin Franklin, Alexander Hamilton, Baron de Montesquieu, James Monroe, Samuel Adams and Patrick Henry on Humy.ai — when students ask about related events, the AI can quote it and cite it.