Synthetic opioids—principally fentanyl—are the leading cause of death for American adults under 50 and have killed more than 100,000 Americans per year in recent years, though provisional 2024 and 2025 data show meaningful declines from the peak. Most fentanyl is produced by Mexican cartels using precursor chemicals largely sourced from China, then smuggled into the United States primarily by U.S. citizens at official border crossings. The Trump administration in 2025 designated several major cartels as Foreign Terrorist Organizations and pursued aggressive border enforcement; debate has intensified over whether and how the U.S. military could be used against cartels operating in Mexico without that country's consent. Public health advocates argue overdose deaths cannot be solved with enforcement alone—treatment access, harm reduction, and stable mental healthcare matter at least as much. Critics argue decades of demand-side policy have failed and that supply-side disruption deserves a much bigger role.
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