Early Tennessee area explorers came from Spain, England, and France. Under the terms of the Treaty of Paris in 1763, France abandoned its claim to the territory to the British.During the War for Independence, soldiers from Tennessee crossed the Great Smoky Mountains and helped to defend South Carolina against the British in the Battle of Kings Mountain. Following the war, the people of Tennessee were dissatisfied with the assistance they were receiving from North Carolina, under whose jurisdiction they were supposed to be governed. In 1784, they formed the unauthorized State of Franklin. Tennessee entered the Union as the 16th state in 1796.Black slaves worked on farms in the western and central parts of Tennessee before the Civil War. After the war, Tennessee was the first state to be readmitted to the Union.During The Great Depression, President Roosevelt pushed legislation through Congress to create the Tennessee Valley Authority. One of the greatest users of TVA power during World War II was Oak Ridge, a city built in secret by The Manhattan Project for the development of the first atomic bomb.