<P> The drafting of the Constitution of the United States began on May 25 , 1787 , when the Constitutional Convention met for the first time with a quorum at the Pennsylvania State House ( now Independence Hall ) in Philadelphia , Pennsylvania to revise the Articles of Confederation , and ended on September 17 , 1787 , the day the Constitution drafted by the convention 's delegates to replace the Articles was adopted and signed . The ratification process for the Constitution began that day , and ended when the final state , Rhode Island , ratified it on May 29 , 1790 . In addition to key events during the Constitutional Convention and afterward while the Constitution was before the states for their ratification , this timeline includes important events that occurred during the run - up to the convention and during the nation 's transition from government under the Articles of Confederation to government under the Constitution , and concludes with the unique ratification vote of Vermont , which at the time was a sovereign state outside the Union . The time span covered is 5 years , 9 months , from March 25 , 1785 to January 10 , 1791 . </P>
<P> The drafting of the Constitution of the United States began on May 25 , 1787 , when the Constitutional Convention met for the first time with a quorum at the Pennsylvania State House ( now Independence Hall ) in Philadelphia , Pennsylvania to revise the Articles of Confederation , and ended on September 17 , 1787 , the day the Constitution drafted by the convention 's delegates to replace the Articles was adopted and signed . The ratification process for the Constitution began that day , and ended when the final state , Rhode Island , ratified it on May 29 , 1790 . In addition to key events during the Constitutional Convention and afterward while the Constitution was before the states for their ratification , this timeline includes important events that occurred during the run - up to the convention and during the nation 's transition from government under the Articles of Confederation to government under the Constitution , and concludes with the unique ratification vote of Vermont , which at the time was a sovereign state outside the Union . The time span covered is 5 years , 9 months , from March 25 , 1785 to January 10 , 1791 . </P>
when was the constitution of united states ratified
when was the constitution of united states ratified
from March 25 , 1785 to January 10 , 1791
from March 25 , 1785 to January 10 , 1791