Nadia S' Mexican American War Timeline By MsOlson Period: Jan 1, 1845 to Jan 1, 1849 Nadia S' Mexican American War Timeline Mar 4, 1845 US Tried to Buy Land (Sidel and Polk) Polk stresses the importance of expanding America in his campaign for president. Jun 16, 1845 Texas Admitted into The Union After annexing itself from Mexico, Texas wanted security so it lobbied to join the US. Jan 1, 1846 US Troops Stationed at Disputed Border Polk orders General Zachary to march to the Rio Grande May 1, 1846 US Declares War In the hopes of intimidating Mexico, Polk asks Congress to declare war on Mexico. Feb 22, 1847 Major US Victory: Battle of Buena Despite being outnumbered 3 to 1, Taylor army defeats Santa Anna's troops through superior firepower. Sep 14, 1847 Mexico City Surrenders After continuous shelling of the Castle of Capultepec for 14 hours, American forces defeat the Mexicans. They take over the city the very next day. Feb 2, 1848 The Treaty of Guadalupe Hidalgo Mexican and American negotiators complete the Treaty of Guadalupe Hidalgo in which the US will recieve California and New Mexico as well as being able to keep Texas' borders for 15 million dollars.