How the Constitution
Came to Be

Today, the Constitution may seem like a fixed, stable document. But it was originally crafted over more than 80 days of debate.

From May to September 1787, fifty-five delegates gathered in Philadelphia to form a new government.

James Madison kept meticulous daily notes — the most complete record we have of how the Constitution was built, argument by argument, vote by vote.

The structure of the Constitution we have today depended on these debates and decisions. Walk through the Convention day-by-day to explore how the Constitution came to be.

87 days  ·  May 14 – September 17, 1787  ·  Philadelphia, Pennsylvania

Background

The Convention & Its Record

Madison's Notes

James Madison sat near the front of the Pennsylvania State House throughout the Convention, recording as much of each day's debates as he could. He wrote his notes in shorthand during sessions and expanded them in the evenings.

Though not verbatim transcripts, his notes are the most detailed account available of the arguments that shaped each clause of the Constitution. They were first published in 1840, after his death, and remain essential reading for anyone studying American constitutional history.

The text on this site comes from the 1920 edition prepared by Gaillard Hunt and James Brown Scott for Oxford University Press, as archived by the Yale Law School Avalon Project.

The Convention at a Glance

  • The Conventionw as called to address shortcomings in the Articles of Confederation, which provided the structure of the US government during the Revolutionary War and the years immediatly following
  • Convened May 25, 1787, when a quorum was finally reached (12 days after the scheduled start)
  • Held at the Pennsylvania State House (now called "Independence Hall") in Philadelphia
  • 55 delegates attended; 39 ultimately signed the finished Constitution
  • Delegates represented each of the 13 states except for Rhode Island, which refused to send any delegates
  • Sessions were held in strict secrecy, with no outside observers allowed
  • The Convention was called to revise the Articles of Confederation, but the delegates quickly decided to replace them entirely
  • After more than 80 days of debate over three months, the Constitution was finally completed and signed on September 17, 1787

Notable Days

Pivotal Moments in the Debates

May 14 & 25, 1787

The Convention Opens

The Convention was scheduled for May 14, but delegates trickled in slowly. A quorum of seven states was not reached until May 25, when George Washington was elected President of the Convention.

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May 29, 1787

The Virginia Plan

Edmund Randolph presented the Virginia Plan — a sweeping proposal for a new national government with three branches and representation based on population. It set the agenda for the entire Convention.

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June 15, 1787

The New Jersey Plan

William Paterson presented a rival plan favored by small states, proposing to amend the Articles of Confederation rather than replace them, with equal representation for all states.

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July 12, 1787

The Three-Fifths Compromise

Delegates agreed to count enslaved people as three-fifths of a person when apportioning congressional seats, giving slaveholding states more political power—an early sign of tensions that would eventually erupt in the Civil War.

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July 16, 1787

The Great Compromise

After weeks of deadlock, delegates narrowly adopted the Connecticut Compromise: a bicameral legislature with proportional representation in the House and equal representation in the Senate.

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August 6, 1787

Committee of Detail Report

The Committee of Detail presented the first full draft of the Constitution — a 23-article document that gave the delegates concrete text to debate, amend, and refine over the following weeks.

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September 17, 1787

The Constitution Signed

Benjamin Franklin gave his famous closing speech urging unanimous support. Thirty-nine delegates signed the Constitution. The Convention adjourned, and the ratification campaign began.

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