Strong economic interdependence through the USMCA, extensive bilateral security cooperation on fentanyl interdiction and migration, and Mexico’s firm defense of sovereignty have anchored trader consensus against a U.S. invasion in 2026. Early-year rhetoric from U.S. officials about potential strikes on cartels produced temporary market volatility but yielded no military escalation; instead, joint operations, record Mexican seizures, and sharply lower border crossings reinforced collaborative patterns. A full-scale invasion would require congressional authorization, risk severe trade disruption, and face domestic political barriers absent any comparable precedent or active conflict. Late developments such as sudden collapse of enforcement gains or explicit congressional authorization could still shift probabilities, though neither appears imminent by year-end.