The Battle of Gettysburg, fought from July 1 to July 3, 1863, is considered the most important engagement of the American Civil War. After a great victory over Union forces at Chancellorsville, General Robert E. Lee marched his Army of Northern Virginia into Pennsylvania in late June 1863.
New forms of transportation such as the steamboat and the railroad helped the nation expand trade. Meanwhile, innovations such as the modern assembly line and electric light bulb revolutionized both business and personal life
