Traders assign a 98.7% probability to no U.S. invasion of Mexico in 2026 because bilateral relations center on coordinated security operations, intelligence sharing, and trade negotiations rather than military confrontation. Mexican President Claudia Sheinbaum has repeatedly affirmed sovereignty as a red line, rejecting foreign troops on national soil, while U.S. officials emphasize joint efforts against cartels designated as terrorist organizations. Recent developments include U.S. strikes on drug vessels at sea, Mexican-led operations with American support, and ongoing USMCA talks aimed at tariffs and supply chains ahead of U.S. midterms. Full-scale invasion would require congressional authorization, face diplomatic isolation, and risk disrupting extensive economic ties. Scenarios that could still shift odds include a major cartel attack on U.S. territory or abrupt policy reversal, though neither appears imminent based on current diplomatic and military postures.