Title II
CHAPTER I
Of the National Sovereignty and Form of Government
Art. 39. The national sovereignty is vested essentially and originally in the people. All public power emanates from the people, and is instituted for their benefit. The people have at all times the inalienable right to alter or modify the form of their government.
Art. 40. It is the will of the Mexican people to constitute themselves into a democratic, federal, representative republic, consisting of States, free and sovereign in all that concerns their internal affairs, but united in a federation according to the principles of this fundamental law.
Art. 41. The people exercise their sovereignty through the federal powers in the matters belonging to the Union, and through those of the States in the matters relating to the internal administration of the latter. This power shall be exercised in the manner respectively established by the Constitutions, both Federal and State. The constitutions of the States shall in no case contravene the stipulations of the Federal constitution.
