 From that point onward, the National Wrestling Alliance World Heavyweight Championship (the championship belt that Thesz opted to keep as the designation of all the championships he had won) became the undisputed world heavyweight title for all contenders to seek.This, however, would change over the years and decades to come as professional wrestling grew and evolved.The American Wrestling Association, owned by Verne Gagne split off from the NWA and declared their primary singles title a world title in 1960.