The National Wrestling Alliance (NWA) is a professional wrestling governing body which has historically been the largest league of independent wrestling promotions in the world. The organization sanctions various NWA championship bouts within its member promotions. The NWA has been in operation since 1948. Prior to the 1960s, it acted as the sole governing body for most of professional wrestling, operating as a talent and brand name franchiser for the inter-regional "territory" system.
Before the NWA was founded in 1948, there existed many regional professional wrestling promotions across North America (each promoting its own "World" champion). None of them, however, had backing or recognition outside of their own respective geographic base-areas. The concept of the NWA was to consolidate the championships of these regional companies into one true world championship of pro wrestling, whose holder would be recognized worldwide. In 1948, Paul "Pinkie" George, a promoter from the Midwest, founded the original version of the National Wrestling Alliance with the backing of five other promoters (Al Haft, Tony Strecher, Harry Light, Orville Brown, and Sam Muchnick). This newly formed NWA Board of Directors wanted Brown to be the first-ever NWA World champion. During the reign of the second NWA World Heavyweight Champion, Lou Thesz (1949–1956), the title was further unified with several more previously-competing "World" titles, such as those recognized jointly by the National Wrestling Association and the American Wrestling Alliance (in Boston), plus another version promoted from the Los Angeles Olympic Auditorium. This legitimized the NWA's claim that its title was a "Unified World Title," and its lineage continues to this day.