Answer: Delaware: December 7, 1787
Pennsylvania: December 12, 1787
New Jersey: December 18, 1787
Connecticut: January 9, 1788
Massachusetts: February 6, 1788
Maryland: April 28, 1788
New Hampshire: June 21, 1788
New York: July 26, 1788
Rhode Island: May 29, 1790
Vermont: March 4, 1791
Explanation: I gave you 10 just in case you needed extra :)