US History 1776 to 1870 By dbttimeline Jul 4, 1776 Declaration of Independence approved. Mar 1, 1781 Articles of Confederation ratified. Jul 13, 1787 Northwest Territory Jun 21, 1788 US Constitution ratified Dec 15, 1791 Bill of Rights ratified 1793 Cotton gin invented 1800 Library of Congress founded 1803 Louisiana purchase Feb 24, 1803 Marbury vs. Madison 1807 Steamboat Invented 1812 War of 1812 1817 Erie Canal constructed 1823 Monroe Doctrine May 28, 1830 Indian Removal Act 1831 Nat Turner's Rebellion 1844 1st Telegraph transmission Dec 29, 1845 Annexation of Texas Feb 2, 1848 Treaty of Guadalupe Hidalgo 1850 Compromise of 1850 1861 American Civil War Period: 1861 to 1865 American Civil War 1863 Homestead Act 1865 13th Amendment 1868 14th Amendment May 10, 1869 1st transcontinental Railroad 1870 15th Amendment