Mexican Drug War: Timeline & Latest Developments

Mexico’s drug war is dated from December 11, 2006, when newly inaugurated President Felipe Calderón deployed roughly 6,500 soldiers to his home state of Michoacán against cartel trafficking networks, launching a militarized “decapitation” strategy built around capturing or killing cartel leadership. Mexican and independent trackers estimate the strategy helped drive more than 120,000 homicides during Calderón’s 2006-2012 term alone, and while it removed dozens of top traffickers, including engineering the 2016 recapture of Joaquín “El Chapo” Guzmán after his 2015 prison escape, it also fractured large cartels into smaller, more violent factions competing for territory. Enrique Peña Nieto’s 2012-2018 administration continued heavy military and federal police deployment while trying to de-emphasize kingpin captures, but homicides climbed again after 2015 and reached what was then modern Mexico’s highest annual level by the end of his term. Andrés Manuel López Obrador took office in December 2018 promising “abrazos, no balazos,” hugs, not bullets, a doctrine of addressing organized crime’s socioeconomic roots rather than confronting it militarily, even as his government created a military-led National Guard and continued deploying troops. AMLO’s own government inadvertently illustrated the doctrine’s limits on October 17, 2019, when a botched attempt to arrest Ovidio Guzmán, a son of El Chapo, in Culiacán triggered a cartel siege of the city so severe that authorities released him rather than continue fighting, an episode AMLO later called his most regretted decision as president.

The 2020s opened with that same tension between social-policy rhetoric and continued state-cartel confrontation. Diplomatic friction over the US arrest of former defense minister Salvador Cienfuegos in October 2020 led Mexico to strip visiting foreign agents of legal immunity, and in April 2022 AMLO’s government disbanded a DEA-vetted anti-narcotics unit it said had been infiltrated by organized crime, straining bilateral cooperation even as Mexican forces recaptured wanted trafficker Rafael Caro Quintero that July and, in January 2023, recaptured Ovidio Guzmán in a gun battle that killed 29 people. A US jury’s February 2023 conviction of Genaro García Luna, Mexico’s own former top security official, for taking millions in Sinaloa Cartel bribes underscored that state complicity, not just cartel violence, has been part of this conflict’s story. Mexico’s national homicide count fell for four consecutive years through 2023, but a wave of at least 37 candidate assassinations during the 2024 election season was an early sign that violence was not simply receding.

The trigger for the decade’s deadliest stretch was the July 25, 2024 arrest of Sinaloa Cartel co-founder Ismael “El Mayo” Zambada and Joaquín Guzmán López, a son of El Chapo, after their plane landed near El Paso, Texas. Zambada said in a letter that Guzmán López had lured him to a fake peace meeting and delivered him to US custody against his will, an account US officials have not confirmed and Guzmán López’s own defense disputes. Six weeks later, on September 9, 2024, gunmen loyal to Zambada’s son formally went to war against Los Chapitos, the faction led by El Chapo’s remaining sons, plunging Culiacán and much of Sinaloa state into sustained urban combat. Culiacán’s homicide count roughly tripled within two months, Mexican forces killed and captured Chapitos and La Mayiza figures on both sides through 2025, CJNG entered the conflict allied with Los Chapitos by mid-2025, and by the time a senior Chapitos security official was assassinated in Mexico City in December 2025, the war had killed or disappeared more than 4,000 people and displaced roughly 1,763 families, according to open-source conflict tracking, with dozens of rural communities abandoned outright.

Washington’s response has layered new pressure onto that internal cartel war. The second Trump administration designated the Sinaloa Cartel, CJNG, and four other Mexican organizations as Foreign Terrorist Organizations in February 2025, unlocking broader legal authorities against them, while separately using fentanyl trafficking as the stated justification for tariffs on Mexican goods that started at 25% in February 2025 and rose to 30% in July of that year. Sheinbaum has generally worked to negotiate around the pressure, agreeing to send 10,000 National Guard troops to the border in exchange for an initial tariff pause and overseeing the largest single extradition of cartel figures in Mexican history, 29 defendants including Caro Quintero, in February 2025, while publicly rejecting a separate Trump proposal to send US troops into Mexico outright. The Trump administration has continued to weigh more direct options, including drone strikes on cartel infrastructure, with officials describing a preference for coordination with Mexico but not ruling out unilateral action. The clearest instance of that quiet cooperation came February 22, 2026, when Mexican special forces, acting on intelligence including support from the United States, killed CJNG founder Nemesio Oseguera Cervantes, “El Mencho,” in Jalisco, triggering a day of cartel retaliation that blocked roads at more than 250 points across 20 states. As of mid-2026, Sheinbaum’s government points to a reported 30% national homicide decline in 2025 as evidence her strategy is working, a claim security researchers and NGOs treat with some skepticism given documented incentives for local prosecutors to reclassify killings as lesser crimes, even as fresh violence, including cartel drone attacks on rural Guerrero communities during World Cup security operations and ongoing clashes in Sinaloa, shows the underlying conflict is far from resolved.