Brendan P's Mexican American timeline By MsOlson Period: Jan 1, 1845 to Jan 1, 1849 Mexican American war Mar 1, 1845 Texas Admitted to the union Texas is annexed to the union by president John Tyler Nov 1, 1845 US Tried to buy land (Sidel and Polk) President Herrera is labled a traitor by newspapers because they think he is going to sell Mexicos northern territories. Apr 7, 1846 US troops stationed at disputed border General Taylor marches his army into disputed territory. May 7, 1846 US declares war Polk is asked by General Taylor to declare war. Feb 22, 1847 US victories The Batlle of Buena, Taylor defeats Santa Anna Sep 14, 1847 Mexico City surrendered US Army takes over Mexico City. Feb 2, 1848 Treaty of Guadelupe Hidalgo Treaty of Guadelupe Hidalgo is signed.