By July 2, 1788 ten states had ratified the constitution and it was formally adopted, but it did not go into effect until March 4,1789, and was formally accepted by all thirteen states as the Supreme Law of the Land in 1790.
The Constitutional Convention adopted the Constitution in May 1787. The Constitution was adopted on September 17, 1787.
I think it's Philadelphia
qd
An amended version of the Virginia plan was adopted at the Constitutional convention. The Constitutional convention was held in Philadelphia from May 25th to September 17th, 1787.
Sep 17, 1787:
1776 in Philidelphia
Roger Sherman.
The Constitutional Convention took place in Philadelphia from May 25 to September 17th, 1787. The convention was presided over by future president George Washington. The Constitution was ratified in 1789 and has been in effect since that time.
This answer needs some explanation. The US Constitution was not "adopted" by the "continental congress." By that time there no longer was a "continental congress" in the same form as the one that had adopted the Declaration Of Independence. There was a "Congress" under the Articles of Confederation and it authorized the formation of a "Constitutional Convention" to revise the Articles of Confederation on February 21, 1787. On September 17, 1787, the Constitutional Convention adopted the final form of the US Constitution, presented it to Congress and recommended its ratification by the states. on September 28, 1787, Congress directed that the proposed Constitution be sent to the legislatures of each state so that they could form their own Constitutional Conventions for the purposes of ratifying the Constitution.
Roger Sherman.
Roger Sherman
The United States Constitution was adopted on Sept. 17, 1787. by the constitutional Convention in Philadelphia , and later ratified by conventions in each state.