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World War II

On December 8, 1941, hours after the attack on Pearl Harbor, Japanese forces from the Marianas launched an invasion of Guam. Chamorros from the Northern Marianas, which had been under Japanese rule for more than 20 years, were brought to Guam to assist the Japanese administration. This, combined with the harsh treatment of Guamanian Chamorros during the 31-month occupation, created a rift that would become the main reason Guamanians rejected the referendum on reunification of Guam with the Northern Marianas that was approved by the Northern Marianas in the 1960s.

On June 15, 1944, the United States military invaded the Mariana Islands, starting the Battle of Saipan, which ended on July 9. Of the 30,000 Japanese troops defending Saipan, fewer than 1,000 remained alive at the battle's end. Many civilians were also killed, by disease, starvation, enemy fire, or suicide; about 1,000 civilians killed themselves by jumping off cliffs. U.S. forces then recaptured Guam on July 21, and invaded Tinian on July 24. A year later Tinian was the takeoff point for the Enola Gay, the plane that dropped the atomic bomb on Hiroshima. Rota was left untouched (and isolated) until the Japanese surrender in August 1945, owing to its military insignificance and U.S. forces' strategy of "island hopping" in which they did not invade islands that they did not need. The story of the holdouts on Anatahan was told in 1953 by Josef von Sternberg in his film The Saga of Anatahan.

The war did not end for everyone with the signing of the armistice. The last group of Japanese holdouts surrendered on Saipan on December 1, 1945. However, as mentioned, a group of about 30 held out until 1951 on Anahatan. The bizarre story has been the subject several movies and writings including The Saga of Anatahan. On a related note, on Guam, Japanese soldier Shoichi Yokoi, unaware that the war had ended, hid in a jungle cave in the Talofofo area until 1972.

Japanese nationals were eventually repatriated to the Japanese home islands. After World War II, the people of Marianas were able to return to the Northern Marianas, under protection of the United Nations Trusteeship administered by the United States. During this time a series of referendums took place.