Timeline of U.S. Government By levnayberger Jun 15, 1215 Magna Carta Nov 11, 1620 Mayflower Compact Jul 4, 1776 Declaration of Independence Jul 13, 1787 Northwest Ordinance Sep 17, 1787 US Constitution signed Jun 21, 1788 US Constitution ratified Sep 24, 1789 Judiciary Act of 1789 Period: 1790 to 1930 Dual Federalism Era Dec 15, 1791 Bill of Rights adopted Feb 7, 1795 11th Amendment ratified (February 7, 1795) 1798 Alien and Sedition Acts passed 1803 Marbury v. Madison 1803 Louisiana Purchase Jun 5, 1804 12th Amendment ratified 1819 McCulloch v. Maryland 1820 Missouri Compromise 1824 Gibbons v. Ogden 1830 Indian Removal Act passed 1854 Kansas–Nebraska Act passed 1857 Dred Scott v. Sandford Apr 12, 1861 Civil War Begins 1862 Homestead Act passed Dec 6, 1865 13th Amendment ratified Apr 9, 1866 Civil Rights Act of 1866 passed Jul 9, 1868 14th Amendment ratified Feb 3, 1870 15th Amendment ratified 1890 Sherman Antitrust Act passed 1896 Plessy v. Ferguson 1913 Federal Reserve Act passed Feb 3, 1913 16th Amendment ratified Apr 8, 1913 17th Amendment ratified Jan 16, 1919 18th Amendment ratified Aug 18, 1920 19th Amendment ratified Jan 23, 1933 20th Amendment ratified Dec 5, 1933 21st Amendment ratified 1935 Social Security Act passed 1938 Fair Labor Standards Act passed 1944 GI Bill of Rights passed Feb 27, 1951 22nd Amendment ratified 1954 Brown v. Board of Education 1958 National Aeronautics and Space Act passed Mar 29, 1961 23rd Amendment ratified 1963 Gideon v. Wainwright Jan 23, 1964 24th Amendment ratified Jul 2, 1964 Civil Rights Act of 1964 passed Aug 6, 1965 Voting Rights Act of 1965 passed 1966 Miranda v. Arizona Feb 10, 1967 25th Amendment ratified 1969 Tinker v. Des Moines Jul 1, 1971 26th Amendment ratified Period: 1972 to 1974 Watergate Scandal 1973 Roe v. Wade 1980 New Federalism Era begins 1980 Fiscal Federalism Era begins 1990 Americans with Disabilities Act passed May 7, 1992 27th Amendment ratified Oct 26, 2001 USA PATRIOT Act passed Jul 27, 2006 Voting Rights Act of 2006 Extension Mar 23, 2010 Affordable Care Act passed 2015 Obergefell v. Hodges