From Sinaloa’s pill presses to Arizona’s gun shops, fentanyl and firearms move in opposite directions, binding America’s overdose crisis to Mexico’s bloodshed in a single deadly feedback loop. A New Triangle Replaces the Old MapFor decades, the phrase “Mexico’s golden triangle” meant opium poppies—Sinaloa, Durango, and Chihuahua supplying the heroin trade. Here, nearly all fentanyl seizures take place—92% of powder and 96% of tablets since 1990—according to the Global Initiative against Transnational Organized Crime. That fact anchors Mexico’s lawsuit against five Arizona gun shops, accused of knowingly fueling trafficking networks. Across the border, the U.S. overdose rate now sits at 21.5 per 100,000, with fentanyl the overwhelming driver.