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The Mexican-American War ended with the signing of the Treaty of Guadalupe Hidalgo on February 2, 1848. When representatives of the belligerents met in Santiago de Querétaro on May 30 of that year to exchange their ratifications of the treaty, they negotiated a protocol consisting of three articles explaining the treaty's amendments.

The original treaty is historically notable for being the oldest living treaty between Mexico and the United States and for granting citizenship to Mexicans who remained in the new American lands for more than a year. The protocol, however, has also been the subject of controversy because of the American government's refusal to honor it, claiming that the representative who negotiated it, Nicholas Trist, exceeded his authority in doing so.

The version of the treaty ratified by the U.S. Senate (as required by American law) differed from the original version by eliminating Article X, which would have required the United States to honor land grants made by the Spanish and Mexican governments in the lands now ceded to the United States. Wording in Article IX was also changed such that Mexicans would be granted citizenship “at the proper time (to be judged by the U.S. Congress)” rather than “as soon as possible.” The protocol as negotiated by Trist downplayed these changes by affirming that they did not constitute a change in the legitimacy of Mexican land grants or the rights granted to Mexican residents of the ceded lands.

Negotiation of the Treaty

Luis Cuevas, Bernardo Couto, and Miguel Atristain negotiated for Mexico on behalf of interim Mexican president Manuel de la Pena y Pena. In 1847, U.S. President James K. Polk had sent Nichols P. Trist as his emissary with a draft of the settlement, but he recalled him from service the following year. Across the continent, Trist met with Mexican negotiators anyway, hammering through the most difficult provisions regarding money, land, and recognition of Mexican citizens. Neither the Mexican nor American congresses supported the treaty signed in February 1848 but ultimately acquiesced, understanding that the only other option was a return to active warfare, which neither side wanted.

In February 1848, at the tentative end of nearly two years of war between the United States and Mexico, the Treaty of Guadalupe Hidalgo was negotiated and exchanged for ratifications in the congresses of Mexico and the United States, in both English and Spanish. Both nations were to return with original, signed, and ratified copies of the treaty within four months or less. Unfortunately for Mexico, when the representative returned with the U.S. version, important modifications and rationale were included.

To appease those in the U.S. Congress who felt that the United States should take all of Mexico and leave nothing for the losing side, Article X of the treaty was removed, which had agreed to honor the character of land grants as they had been given, the same as if they had remained within the boundaries of the newly defined Mexican nation.

Article IX was substantially shortened, taking out specific references to the Catholic Church. By removing this article, the United States wanted to clarify what it meant by taking such action. The protocol explained that land grants would be recognized if the grantees proved their legitimate title in the American legal system.

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