Origins of U.S. Government By Michael Rinehart Period: Apr 19, 1775 to Sep 19, 1790 Origins of U.S. Government Period: Sep 19, 1775 to Sep 19, 1783 Revolutionary War Period: Sep 19, 1775 to Sep 19, 1781 Second Continental Congress Jul 2, 1776 Continental Congress adopts Declaration of Independence Jul 4, 1776 Continental Congress adopts a resolution declaring the Colonies' Independence Period: Sep 19, 1781 to Sep 19, 1787 Articles of Confederation Period: Sep 19, 1783 to Sep 19, 1787 Critical Period Sep 19, 1787 Constitutional Convention Jun 21, 1788 9th State Ratifies the Constitution and it Takes Effect Sep 19, 1790 13th State Ratifies Constitution! Sep 19, 1790 Bill of Rights is Ratified!