General Robert E. Lee surrenders to Ulysses S. Grant on April 9, 1865 at Appomattox, effectively ending the American Civil War. Although other Confederate forces; some large units, some small had yet to surrender. It was not until August 20, 1866, sixteen months after Lee's surrender, when President Andrew Johnson formally declared an end to the war. More
Source: Cheney, C. Emma (Clara Emma), No restrictions, via Wikimedia Commons