Congress admitted New Mexico as the 47th state in the Union on January 6, 1912. Albuquerque is the largest city in the state of New Mexico.
The United States government built the Los Alamos Research Center in 1943 amid the Second World War. Top-secret personnel there developed the atomic bomb, first detonated at Trinity site in the desert on the White Sands Proving Grounds between Socorro and Alamogordo on July 16, 1945.
Albuquerque expanded rapidly after the war. High-altitude experiments near Roswell in 1947 reputedly led to persistent but unproven suspicions that the government captured and concealed extraterrestrial corpses and equipment. The state quickly emerged as a leader in nuclear, solar, and geothermal energy research and development. The Sandia National Laboratories, founded in 1949, carried out nuclear research and special weapons development at Kirtland Air Force Base south of Albuquerque and at Livermore, California.