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The Ultimate Fighting Championship (UFC) is a US based mixed martial arts organization. Inspired by Brazilian vale tudo, the UFC began in Denver, Colorado in 1993 as a single-event tournament designed to find the world's best fighters, regardless of their fighting style (whether boxing, kickboxing, wrestling, karate, Brazilian jiu jitsu or other disciplines). Although they did prescribe a limited number of rules, promoters marketed fighting in the UFC as no holds barred, and contests were often violent and brutal, leading critics like Senator John McCain to dub the sport "human cockfighting.