I just returned from a great time at the New Mexico Historical Society’s Conference in Albuquerque. It was great seeing old friends and meeting new people. While there I talked with John Ramsey who is doing research when Arizona and New Mexico were one territory and much of southern Arizona was part of Dona Ana County. I have not found much yet, but let me know if you have any leads. It is coincidental that today in 1846 Congress approved President James K. Polk’s request to declare war on Mexico. After two years of fighting, the United States and Mexico signed the Treaty of Guadalupe Hidalgo on Feb. 2, 1848. A large part of northern Mexico, including northern Arizona and New Mexico, was ceded to the U.S. In 1854, the U.S. acquired the southern portion of this territory with the Gadsden Purchase. To learn more about the 1846-48 War with Mexico, you might want to read Amy Greenberg’s A Wicked War: Polk, Clayk, Lincoln, and the 1846 U.S. Invasion of Mexico or the classic history by K. Jack Bauer, The Mexican War 1846-1848.