This made it so they could control islands that had once been under the rule of Japan. It was successful because it was random and made it so the Japanese could not figure out what island would be invaded next and try to stop the invasion or try to intercept the fleet in the ocean.
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The Allies hit strategic islands that were needed for either basing for the Marines or the army, but mainly for the use of airbases to run bombing missions on Japan and other importing island garrisons and bases. So MacArthur and Nimitz hit the most needed islands all the way up to Iwo Jima and Okinawa.
By the Allies 'island-hopping' strategy this allowed them to get closer to Japan, which was their main goal, in order to bomb it from the now captured island airstrips.
Sicily
The war against Japan
island hopping
Only islands that were not well defended.
The Japanese planned on attacking the Aleutian Islands to combat the "island hopping" strategy that Douglas MacArthur was using in the Pacific Ocean.