timeline By ashabadash Period: Jun 12, 1770 to Jun 12, 1800 years states enter union Jul 4, 1776 Declaration of Independence Dec 7, 1787 Delaware joins Union Dec 12, 1787 pennslyvania joins union Dec 18, 1787 new jersey Jan 2, 1788 georgia joins Jan 9, 1788 conneticut Jun 1, 1792 kentucky