Rowan Brubach's Mexican American War Timeline By MsOlson Period: Jan 1, 1845 to Jan 1, 1849 Rowan Brubach's Mexican American War Timeline Jun 16, 1845 Texas Admitted to the Union Texas joins and accepts the U.S.'s offer of annexition. Nov 7, 1845 US Tried to Buy Land(Sidel and Polk) Polk sends Sidel to Mexico in order to buy New Mexico and California. Though, when newspapers claim that President Herrera is a traitor, Herrera refuses to meet Sidel. Mar 7, 1846 US Troops Stationed at Disputed Border General Taylor leads his army into disputed territory clamied by both Mexico and the US. May 1, 1846 US Declares War Congress approves $10 million and 50,000 volunteers for the war effort. Polk hopes this will intimidate Mexico into settling the border issue and selling both California and New Mexico to the US. May 8, 1846 US Victories (Battles of Palo Alto/Resaca de la Palma) Winning both of these battles, Taylor's army drives the Mexicans back across th Rio Grande. Sep 12, 1847 Mexico City Surrendered Battle in Mexico City: Unable to get reinforcements, the Mexicans succumb. Feb 2, 1848 Treaty of Guadelupe Hidalgo Trist and Mexican negotiators settle on an agreement where the US will get California, New Mexico, and have to mantain the border of Texas at the Rio Grande for $15 million.