Ava and Chris By Mrs.Weiss Jul 13, 1778 continental congress passes The continental congress passed the northwest ordnance on July,13,1778 Jul 13, 1787 Northwest Ordinance Created The Northwest Ordinance was signed and passed on July 13 1787. Period: Jan 13, 1788 to Dec 25, 1789 Permanent Female Settlers The first permanent female settlers arrived with their family's in Marietta between 1788 and 1789.