The U.S. signed treaties with the Chickasaw and Choctaw tribes to maintain peace, as European Americans entered the area in greater numbers. In 1801 the United States Army began trail blazing along the Trace, performing major work to prepare it as a thoroughfare. The work was first done by soldiers reassigned from Tennessee and later by civilian contractors. To emphasize American sovereignty in the area, Jefferson called it the "Columbian Highway." The people who used it, however, dubbed the road as "The Devil's Backbone" due to its remoteness, rough conditions, and the frequently encountered highwaymen found along the new road.