India H's Mexican American War Timeline By MsOlson Period: Jan 1, 1845 to Jan 1, 1849 Mexican American War Mar 1, 1845 Texas Admitted to the Union John Tyler signs resolution to annex Texas, Nov 1, 1845 US Tried to Buy Land (Sidel and Polk) Mar 1, 1846 US Troops Stationed at Disputed Border General Taylor went to the Nueces River claimed by America and Mexico. May 1, 1846 US Declares War Polk's proposition of war is accepted by congress. May 8, 1846 Battles of Palo Alto John Tyler's army wins which makes the Mexicans retreat back to the Rio Grande. Sep 14, 1847 Mexico City Surrendered General Winfield Scott captured Mexico City. Feb 2, 1848 Treaty of Guadelupe Hidalgo America and Mexico came to the agreement that Mexico must cede 55% of its land to America. And America agreed to give them 15 million dollars in return.