Ashley D mexican american timeline By MsOlson Period: Jan 1, 1845 to Jan 1, 1849 Mexican American War Mar 1, 1845 1845 Texas admitted to the union by signing the congressional resolution president tyler annexes texas Mar 4, 1845 1845 US Tried to Buy Land(Sidel and Polk) In his inaugural speech,President Polk includes expanding the united states and "extending the dominions of peace". Mar 1, 1846 1846 US Troops Stationed at Disputed Border General taylor's army travels south towards Rio Grande, moving into land debated over who both mexico and the US thinks is theirs. May 1, 1846 1846 US Declares War Taylor sends letter to president polk declaring US congress war against Mexico Feb 23, 1847 1846-1848 US Victories(battle of buena vista) though taylors army was outnumbered 15,000 to 5,000 their willpower encouraged them to defeat santa anna's troops. Sep 13, 1847 1847 Mexico City Surrendered after 14 hours of trying to defend castle of capultepec by the US army,without any reinforcements mexico city surrendered. Apr 12, 1848 1848 Treaty of Guadelupe Hidalgo A US negotiator is sent to get treaty signed.Mexico agrees for an exchange of land and 15 million dollars.