Ratification of the Constitution By espinozagilbert Dec 7, 1787 Delaware Ratified the Constitution Period: Dec 7, 1787 to Jun 21, 1788 Ratification of the Constitution Dec 12, 1787 Pennsylvania Ratified the Constitution Dec 18, 1787 New Jersey Ratified the Constitution Jan 2, 1788 Georgia Ratified the Constitution Jan 9, 1788 ConnecticutRatified the Constitution Feb 6, 1788 Massachusetts Ratified the Constitution Apr 28, 1788 Maryland Ratified the Constitution May 23, 1788 South Carolina Ratified the Constitution Jun 21, 1788 New Hamphsire Ratified the Constitution