Matthew S By MsOlson Period: Jan 1, 1845 to Jan 1, 1849 mexican war Jun 16, 1845 Texas Admitted to the Union The Texas congress excepts the Annexation offer from the US, and it becomes part of the united states of America. Nov 1, 1845 US tried to Buy Land (Slidel and Polk) President Polk sends John Slidell to negotiate with the Mexicans about the land. These lands are California, Arizona, Utah, Nevada, Texas, and oklahoma. Mar 1, 1846 Us troops Stationed at disputed Border General Taylor's troops head towards the Rio Grande and towards the disputed land. May 1, 1846 US declares war Polk gets the letter from Taylor and thens asks congress to declare war on Mexico. Feb 22, 1847 The Battle of Buena Vista Taylor was outnumbered but defeated the Mexicans by using his army's huger firepower at this battle. Sep 14, 1847 Mexico City Surrendered Us army occupies Mexico City and takes control of the goverment. Feb 2, 1848 Treaty of Guadelupe Hidalgo Negotiators sign the treaty and then it was rushed up to Washington D.C.