The U.S. Constitution was written in Philadelphia during the Constitutional Convention held from May 25 to September 17, 1787, with the final document completed and signed on September 17, 1787.

Quick Scoop: Core Facts

  • The Constitution was drafted in the summer of 1787.
  • Work took place at the Pennsylvania State House, now called Independence Hall, in Philadelphia.
  • Delegates met from May 25 to September 17, 1787.
  • The final text was approved and signed on September 17, 1787—often treated as the Constitution’s “birthday.”

Short Timeline

  1. May 25, 1787 – Convention opens in Philadelphia to fix the Articles of Confederation.
  1. Summer 1787 – Delegates debate representation, states’ rights, and slavery, and move toward an entirely new framework of government.
  1. September 17, 1787 – Delegates finish, adopt, and sign the Constitution.
  1. 1787–1790 – States debate and ratify the new Constitution; the last of the original 13, Rhode Island, ratifies on May 29, 1790.

Mini Viewpoints: “When Was It Written?”

Different ways people phrase the same answer:

  • By convention period – “It was written between May 25 and September 17, 1787.”
  • By completion date – “It was written in 1787 and signed on September 17, 1787.”
  • By place and time – “It was written in Philadelphia during the summer of 1787.”

All of these point to the same moment in history: the summer-long Convention in 1787 that produced the final text on September 17.

Tiny Story Element

Picture a humid Philadelphia summer in 1787: windows closed for secrecy, guards at the doors, and dozens of delegates arguing day after day over how to design a new government that would actually work. After months of compromise and frustration, they finally agreed on a text, and on September 17, 1787, they lined up to sign the document that would become the U.S. Constitution.

TL;DR: The U.S. Constitution was written in Philadelphia during the Constitutional Convention from May 25 to September 17, 1787, and formally completed and signed on September 17, 1787.

Information gathered from public forums or data available on the internet and portrayed here.