Early American Wars Timeline By stormy_night_sky Apr 19, 1775 The Battles of Lexington and Concord Period: 1777 to 1778 The Winter at Valley Forge Sep 21, 1780 Benedict Arnold turns traitor Jan 17, 1781 The Battle of Cowpens Aug 19, 1812 The USS Constitution defeats the HMS Guerriere Period: Sep 12, 1814 to Sep 15, 1814 The Battle of Baltimore Period: Sep 12, 1814 to Sep 15, 1814 the battle of baltimore Jan 8, 1815 The Battle of New Orleans Period: Oct 31, 1828 to Dec 2, 1828 The Election of Andrew Jackson Period: Feb 23, 1836 to Mar 6, 1836 The Battle of the Alamo 1860 Abraham Lincoln Elected President Period: Nov 3, 1860 to Dec 20, 1860 South Carolina secedes from the United States Jul 21, 1861 The First Battle of Bull Run Period: Jul 1, 1863 to Jul 3, 1863 The Battle of Gettysburg Apr 9, 1865 The Treaty at Appomattox Courthouse 1898 Mexico loses California, New Mexico, and Arizona Feb 15, 1898 The sinking of the USS Maine May 1, 1898 Battle of the Philippines (Spanish American War, not World War II) 1931 The Adoption of the Star Spangled Banner as the National Anthem