Michelle Cibel's Timeline By MsOlson Jun 16, 1845 Texas Admitted to the Union Period: Jun 16, 1845 to Jan 1, 1849 Mexican-American War Nov 1, 1845 US Tried to Buy Land at Disputed Border Mar 1, 1846 US Troops Stationed at Disputed Border May 1, 1846 US Declares War May 8, 1846 The Battle of Palo Alto Sep 13, 1847 Mexico City Surrendered Feb 2, 1848 Treaty of Guadelupe Hidalgo