In short
Fifty-five delegates from twelve states gathered in Philadelphia between May and September 1787 to overhaul America's governing framework. What started as a mission to patch up the failing Articles of Confederation turned into a wholesale rewrite—the delegates scrapped the old system entirely and drafted the U.S. Constitution, creating a stronger federal government with separation of powers. The document they produced became the foundation of American law and one of history's most consequential political blueprints.
How it unfolded.
The five-minute version
What actually happened.
The Constitutional Convention took place in Philadelphia from May 25 to September 17, 1787. While the convention was initially intended to revise the league of states and the first system of federal government under the Articles of Confederation, leading proponents of the Constitutional Convention, including James Madison of Virginia and Alexander Hamilton of New York, sought to create a new frame of government rather than revise the existing one. Delegates elected George Washington of Virginia, former commanding general of the Continental Army in the American Revolutionary War and a proponent of a stronger national government, to serve as president of the convention. While the Constitutional Convention has been the only Federal one, the fifty states have held 233 constitutional conventions. The 1787 convention ultimately debated and ratified the Constitution of the United States, making the convention one of the most significant events in American history.
As it was happening
12 voices, 387 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Convention opens
Delegates convene at Pennsylvania State House with George Washington elected president of the Convention. A quorum of seven states is achieved.
Voices from this moment (1)
Convention opens
May 25
“Delegates convene at Pennsylvania State House with George…”
As it was happening
12 voices, 387 days.
Day 0 · May 25, 1787
Convention opens
Delegates convene at Pennsylvania State House with George Washington elected president of the Convention. A quorum of seven states is achieved.
“Delegates convene at Pennsylvania State House with George…”
- Convention opens, May 25
Day 4 · May 29, 1787
Virginia Plan introduced
James Madison presents the Virginia Plan, proposing a strong federal government with bicameral legislature and executive. It becomes the template for initial debates.
“James Madison presents the Virginia Plan, proposing a…”
- Virginia Plan introduced, May 29
Day 21 · June 15, 1787
New Jersey Plan unveiled
Small states counter with the New Jersey Plan, advocating for equal state representation. The conflict threatens to derail the Convention.
“Small states counter with the New Jersey Plan, advocating…”
- New Jersey Plan unveiled, Jun 15
Day 52 · July 16, 1787
Great Compromise adopted
Delegates agree to a bicameral Congress: House apportioned by population, Senate with two seats per state. The breakthrough allows substantive progress.
“Delegates agree to a bicameral Congress: House apportioned…”
- Great Compromise adopted, Jul 16
Day 73 · August 6, 1787
Draft constitution circulated
The Committee of Detail presents a working draft to the full Convention, consolidating weeks of debate into enforceable language.
“When you assemble a number of men to have the advantage of…”
- Synthesized from period accounts - Convention floor observations, summer 1787, Aug 20
“The Committee of Detail presents a working draft to the…”
- Draft constitution circulated, Aug 6
Day 106 · September 8, 1787
Committee of Style finalizes language
Gouverneur Morris and the style committee polish the draft into its final form. Last-minute amendments are debated and resolved.
“A vigorous national government is in itself the best…”
- Synthesized from period accounts - Convention debates and Federalist Papers, 1787-1788, Sep 10
“Gouverneur Morris and the style committee polish the draft…”
- Committee of Style finalizes language, Sep 8
Day 115 · September 17, 1787
Constitution signed
39 delegates sign the completed Constitution. Benjamin Franklin urges reluctant delegates to support it despite reservations. The document is sent to Congress for transmittal to the states.
“I smell a rat.”
- Synthesized from period accounts - Virginia Ratification Convention speeches, June 1788, Jun 15
“I consent, Sir, to this Constitution because I expect no…”
- Synthesized from period accounts - Convention closing statements, September 17, 1787, Sep 17
“We the People of the United States, in Order to form a more…”
- Preamble to the U.S. Constitution, adopted September 17, 1787, Sep 17
“39 delegates sign the completed Constitution.”
- Constitution signed, Sep 17
The numbers.
3 numbers that anchor the scale.
By the numbers
The countable parts.
Delegates present
0 from 12 states (Rhode Island absent)
Signatories
0 delegates signed the final document
Ratification requirement
0 of 13 states needed to ratify Constitution
Captured in time.
Captured before it changed
The web as it looked, the day it happened.
Wayback Machine snapshots of the pages people actually loaded that day. Click any card to open the archive at full size.
Sources & citations.
Sources
Where this came from.
Every claim on this page traces to a public, license-clean source. We don't asterisk well.
Wikipedia
1 source- 1.American Constitutional Convention
en.wikipedia.org