Clark subsequently built another railroad branching off from Las Vegas to the boom town of Bullfrog called the Las Vegas and Tonopah Railroad. With the revenue coming down both railways that intersected there, the area of Las Vegas was quickly growing. On May 15, 1905, Las Vegas officially was founded as a city when , in what would later become downtown, were auctioned to ready buyers. Las Vegas was the driving force in the creation of Clark County, Nevada in 1909 and the city was incorporated in 1911 as a part of the county. The first mayor of Las Vegas was Peter Buol who served from 1911 to 1913.