Volcano Islands uninhabited. The first recorded sighting by Europeans was in October 1543 by Spanish navigator Bernardo de la Torre on board of carrack "San Juan de Letrán" when trying to return from Sarangani to New Spain. Iwo Jima was charted as Sufre, the old Spanish term for sulphur. The islands were uninhabited until 1889, when the two northern islands were settled by Japanese settlers from the Izu Islands. They were annexed by Japan in 1891. The population was about 1,100 in 1939, distributed among five settlements: Higashi, Minami, Nishi, Kita and Motoyama (meaning "East", "South", "West", "North" and "Mountain of Origin",
Japanese settlement in the Marshall Islands population on the islands was repatriated back to Japan. People of mixed Japanese–Marshallese heritage generally stayed behind, although a few were granted an option if they were above 16 years old. The Japanese–Marshallese quickly assimilated with the Marshallese in the years after the war. Many of them became politicians and businessmen, and in the 1970s people of mixed Japanese–Marshallese heritage controlled most of the private enterprises in the state. Japanese–Marshallese politicians generally held critical opinions on nuclear weapon tests carried out by the United States in Operation Crossroads. At least one ethnologist, Greg Dvorak suggested that the shared Japanese and