Kentucky was granted statehood in 1792, becomingthe first U.S. state west of the Appalachian Mountains. Frontiersman Daniel Boone was one of Kentucky’s most prominent explorers and many immigrants followed the trail he blazed through the Cumberland Gap, known as the Wilderness Road. Although it sided with the Confederacy during the Civil War, the population was deeply divided, and many Kentucky residents fought for the North. Known primarily as an agricultural area into the 20th century, Kentucky is also a major U.S. coal producer andsite of the U.S.military bases Fort Knox and Fort Campbell. It is also known as the home of the legendary Kentucky Derby horse race and bluegrass music, pioneered by Kentucky native Bill Monroe.