Multiple choice The costly invasions of which two islands brought the U.S. the closest to Japan? Iwo Jima and Hiroshima Hiroshima and Nagasaki Midway & Hawaii Iwo Jima and Okinawa Reveal answer Fill a bubble to check yourself D Correct answer Explanation The battles of Iwo Jima and Okinawa were two of the final and most costly battles in the Pacific theater, providing the U.S. with airbases close to the Japanese mainland.