Timeline of Congress By katlyn_morrison Mar 4, 1789 First Congress under the new Constitution Jun 1, 1800 The Congress moves Nov 4, 1811 Henry Clay became the first speaker of the Congress Jan 1, 1819 The Capitol was rebuilt Mar 7, 1850 Webster, Clay, and Cannon passed the Compromise Jan 1, 1852 Webster and Clay die Jan 1, 1861 Jefferson Days Apr 12, 1861 The Civil War starts Jan 1, 1865 Slavery is abolished Mar 15, 1910 Speaker Cannon ended Apr 2, 1917 World War 2 Oct 13, 1918 The Missouri Compromise Dec 7, 1941 Pearl Harbor