Japan became a pacifist country with the 1947 constitution, so America was obligated to protect Japan against foreign threats. During the American military occupation of Japan (1945–52), which followed the Imperial Japanese surrender on September 2, 1945, in Tokyo Bay, the United States controlled Okinawa Island and the rest of the Ryukyu Islands. The Amami Islands were returned to Japanese control in 1953. The remaining Ryukyu Islands were returned to Japan on June 17, 1971