Article 40 Political Constitution of the United Mexican States
Second Title · Chapter I. On National Sovereignty and the Form of Government
Current text · last reform published in the Official Gazette of the Federation (DOF) on 2 June 2026
It is the will of the Mexican people to constitute themselves into a representative, democratic, secular and federal Republic, composed of free and sovereign States in all that concerns their internal regime, and of Mexico City, united in a federation established according to the principles of this fundamental law.
The people of Mexico shall under no circumstance accept interventions, intrusions or any other act from a foreigner that is harmful to the integrity, independence and sovereignty of the Nation, such as coups d'état, interference in elections or the violation of Mexican territory, whether by land, water, sea or airspace.
Nor shall it consent to any intervention in investigation and prosecution without the express authorization and collaboration of the Mexican State, within the framework of the applicable laws.