Nat Turner led a slave rebellion in Virginia in 1831. Harriet Tubman established the Underground Railroad to help escaped slaves. John Brown led an unsuccessful raid on Harper's Ferry in 1859 trying to start a slave rebellion. The North wanted new western states to be free states while the South wanted them to be slave states, contributing to tensions between the regions. The Civil War began after southern states seceded to form the Confederacy in response to Abraham Lincoln's election in 1860. Major battles and events included Bull Run, Monitor vs. Merrimack, Fredericksburg, and the creation of West Virginia. The war ended with Lee's surrender to Grant at Appomattox Court House in 1865.