琉球列島米国民政府
During World War II and battles like the Battle of Okinawa (1945), approximately 150,000 civilians (1/3 of the population) were killed in Okinawa alone. After the war, the Ryukyu Islands were occupied by the United States Military Government of the Ryukyu Islands (1945–1950), but the U.S. maintained control even after the 1951 Treaty of San Francisco, which went into effect on April 28, 1952, as the USMMGR was replaced by the United States Civil Administration of the Ryukyu Islands (1950–1972). During this period the U.S. military requisitioned private land for the building of their facilities, with the former owners put into refugee camps, and its personnel committed thousands of crimes against the civilians. Only twenty years later, on 15 May 1972, Okinawa and nearby islands were returned to Japan. Whereas the Japanese had enjoyed political freedom and economic prosperity in the post-war years, the facilities, used for the purposes of Japanese regional security against the communist threat, had a negative economic impact on the Islands, leading to many Ryukyuans feeling cheated, some considering the facilities a national disgrace. Since 1972 there have been extensive plans to bring Okinawa's economy up to the national level, as well continued support for the local culture and a revival of traditional arts started by the USCAR.