evidence: Fentanyl is now driving the drug overdose crisis across the country. It is the most lethal drug epidemic in American history, the fentanyl crisis. Synthetic opioids, mostly fentanyl, killed an estimated 75,000 Americans in 2023 alone. More than all of the US troops killed in Iraq, Afghanistan and Vietnam combined. Deaths went up 94 percent in a three year period. [...] ZAKARIA: By 2017, fentanyl was causing more overdoses than any other drug in America. Meanwhile, in Mexico, a new president, Andres Manuel Lopez Obrador was embracing a new approach to the drug war. [...] ZAKARIA: And the Little Chapos' lethal product kept on coming. By 2021, American overdose deaths, mostly from fentanyl, were over seven times higher than in 2015.