The United States Drug Enforcement Administration (DEA) states Caro Quintero created the Sonora Cartel from remnants of the Guadalajara Cartel, which was co-founded by his brother Rafael Caro Quintero.
In 1989 Miguel Ángel Félix Gallardo was arrested, causing the splintering of the Guadalajara Cartel into the Sinaloa Cartel, Tijuana Cartel and Sonora Cartel [REF].