Treaty With Mexico 
The Mexican Republic agrees to designate the following as her true limits with the United States for the future: retaining the same dividing line between the two Californias as already defined and established, according to the 5th article of the treaty of Guadalupe Hidalgo, the limits between the two republics shall be as follows: Beginning in the Gulf of Mexico, three leagues from land, opposite the mouth of the Rio Grande, as provided in the 5th article of the treaty of Guadalupe Hidalgo; thence, as defined in the said article, up the middle of that river to the point where the parallel of 3I° 47' north latitude crosses the same; thence due west one hundred miles; thence south to the parallel of 3I° 20' north latitude; thence along the said parallel of 3I° 20' to the IIIth meridian of longitude west of Greenwich; thence in a straight line to a point on the Colorado River twenty English miles below the junction of the Gila and Colorado Rivers; thence up the middle of the said river Colorado until it intersects the present line between the United States and Mexico. . ..
In consideration of the foregoing stipulations, the Government of the United States agrees to pay to the government of Mexico, in the city of New York, the sum of ten millions of dollars . . .
The provisions of the 6th and 7th articles of the treaty of Guadalupe Hidalgo having been rendered nugatory, for the most part,
by the cession of territory granted in the first article of this treaty, the said articles are hereby abrogated and annulled, and the provisions as herein expressed substituted therefore The vessels, and citizens of the United States shall, in all time, have free and uninterrupted passage through the Gulf of California, to and from their possessions situated north of the boundary line of the two countries. It being understood that this passage is to be by navigating the Gulf of California and the river Colorado, and not by land, without the express consent of the Mexican government; and precisely the same provisions, stipulations, and restrictions, in all respects, are hereby agreed upon and adopted, and shall be scrupulously observed and enforced by the two contracting governments in reference to the Rio Colorado, so far and for such distance as the middle of that river is made their common boundary line by the first article of this treaty.
The several provisions, stipulations, and restrictions contained in the 7th article of the treaty of Guadalupe Hidalgo shall remain in force only so far as regards the Rio Bravo del Norte, below the initial of the said boundary provided in the first article of this treaty; that is to say, below the intersection of the 3I° 47' 30" parallel of latitude, with the boundary line established by the late treaty dividing said river from its mouth upwards, according to the fifth article of the treaty of Guadalupe.
The Mexican Government having on the 5th of February, I853, authorized the early construction of a plank and railroad across the Isthmus of Tehuantepec, and, to secure the stable benefits of said transit way to the persons and merchandise of the citizens of Mexico and the United States, it is stipulated that neither government will interpose any obstacle to the transit of persons and merchandise of both nations; and at no time shall higher charges be made on the transit of persons and property of citizens of the United States, than may be made on the persons and property of other foreign nations, nor shall any interest in said transit way, nor in the proceeds thereof, be transferred to any foreign government.
The United States, by its agents, shall have the right to transport across the isthmus, in closed bags, the mails of the United States not intended for distribution along the line of communication; also the effects of the United States government and its citizens, which may be intended for transit, and not for distribution on the isthmus, free of custom-house or other charges by the Mexican government. Neither passports nor letters of security will be required of persons crossing the isthmus and not remaining in the country.
When the construction of the railroad shall be completed, the Mexican government agrees to open a port of entry in addition to the port of Vera Cruz, at or near the terminus of said road on the Gulf of Mexico.
The two governments will enter into arrangements for the prompt transit of troops and munitions of the United States, which that government may have occasion to send from one part of its territory to another, lying on opposite sides of the continent.
The Mexican government having agreed to protect with its whole power the prosecution, preservation, and security of the work, the United States may extend its protection as it shall judge wise to it when it may feel sanctioned and warranted by the public or international law.