Important US Events By AllyWan Apr 19, 1775 Beginning of Revolutionary War Shots fired at Lexington and Concord May 13, 1846 Mexican-American War Begins Nov 6, 1860 Abraham Lincoln Elected President He became the 16th president. Apr 12, 1861 Civil War Begins Jul 1, 1863 Battle of Gettysburg Apr 14, 1865 President Lincoln Assassinated He was assassinated by John Wilkes Booth. Dec 7, 1941 Bombing of Pearl Harbor This began WWII