On May 30, 1848, when the two countries exchanged ratifications of the Treaty of Guadalupe Hidalgo, they continued to negotiate a three-article protocol to explain these changes. The first article stated that the original Article IX of the treaty, although it had been replaced by Article III of the Louisiana Treaty, would still confer the rights set out in Article IX. The second article confirmed the legitimacy of land uses under Mexican law.  U.S. troops quickly went far beyond Texas to conquer Alta California and New Mexico. The fighting ended on January 13, 1847 with the signing of the “surrender agreement” at Campo de Cahuenga and the end of the Taos Revolt.  By mid-September 1847, American troops had successfully penetrated central Mexico and occupied Mexico City.  Nicholas Trist, chief secretary of the Ministry of Foreign Affairs headed by President Polk, eventually negotiated a contract with the Mexican delegation after ignoring its dismissal by President Polk out of frustration at the failure of a contract.  Despite the fact that the treaty was negotiated against his instructions, President Polk forwarded it to the Senate in light of the achievement of the great American objective.  Exchange Copy of the Treaty of Guadalupe Hidalgo, written in Spanish and English, Proof that the treaty was ratified by the Mexican government By ignoring the presidential mandate to recall that his spite would cost him his career, Trist decided to respect his own principles and negotiate a treaty, which violated his instructions.
His views briefly made him a very controversial figure in the United States. After the defeat of the Mexican army and the fall of Mexico City in September 1847, the Mexican government capitulated and peace negotiations began. The war officially ended with the signing of the Treaty of Guadalupe Hidalgo in Mexico on February 2, 1848. The treaty added an additional 525,000 square miles to the territory of the United States, including the country that makes up present-day Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming in whole or in part. Mexico also abandoned all claims to Texas and recognized the Rio Grande as America`s southern border. In exchange, the U.S. paid $15 million to Mexico and agreed to settle all U.S. citizens` claims against Mexico. Trist sent a copy of the fastest means available to Washington, forcing Polk to decide whether or not to refuse the highly satisfactory manual labor of his discredited subordinate. Polk decided to forward the contract to the Senate. On March 10, 1848, when the Senate reluctantly ratified the treaty (by a vote of 34 to 14), it removed Article X, which guaranteed protection for Mexican land allocations. After ratification, U.S.
troops were withdrawn from the Mexican capital. The version of the treaty, ratified by the U.S. Senate, removed Article X, which stated that the United States . . .