Ulysses S. Grant rose through the ranks of the Union Army during the American Civil War, culminating in his role as commanding general. As general, Grant led the Union to key victories such as at Fort Donelson and Vicksburg, cutting the Confederacy in two. After the war, Grant served two terms as the 18th U.S. President from 1869 to 1877, though his presidency faced scandals. However, the 15th Amendment guaranteeing voting rights regardless of race was ratified during his time as president.