Stephen Polk wanted to gain more land, but by doing this he needed to make an agreement with Mexico officials. They were not even happy to discuss his offer. As war began to rage with the facts of The Mexican soldiers firing on the U.S. troops who were patrolling along the Rio Grande. Two days after Polk made a speech on the facts that the Mexicans had killed some Americans, congress declared war on Mexico. The Mexican war had begun. As the U.S. was waiting and going along, they invaded Mexico to try and end this. In the early time of 1848 Mexico and The United States signed the treaty of Guadalupe Hidalgo. Mexico gave Texas to the United States as well as a vast region known as the Mexican Session. Within a few years The United States was still acquiring land from Mexico. And in 1853 James Gadsden arranged a purchase of a strip of land south of the Mexican Cession, this was known as the Gadsden Purchase. This purchase included land that was flat for railroad service which would mean this would create a good railroad route. This created the present-day border of the southwestern United States with Mexico.
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