The prosperity that accompanied the return of the troops led to the organization of Presidio County, which had been formed out of El Paso County in 1850. Two previous attempts to organize it had failed. Finally, on May 12, 1871, Presidio county was organized, with Fort Davis as the county seat. In 1882, however, when the Southern Pacific built through the area, it bypassed Fort Davis. The residents of Marfa thought that their town, which was on the railroad, should be the county seat. A new election was held on July 14, 1885, and although the results were disputed, Marfa won. The residents of Fort Davis immediately called for a new county, and on March 15, 1887, an act of the state legislature established Jeff Davis County, named for the president of the Confederacy. It was organized 5/24/1887 and Fort Davis was again a county seat, but the rivalry with Marfa continued as a dispute about the county line. The boundary quarrel, eventually decided in the courts, was not settled until January 1905, when Jesse W. Merrill and S. A. Thompson surveyed a new county line. -Handbook of Texas Online: Jeff Davis County