New Guinea Campaign. 1942-1945. Major Campaign of WWII. Before the war, the island of New Guinea was split between: Territory of New Guinea – north-eastern part controlled by Australia Territory of Papua – south-eastern part, an Australian colony Dutch New Guinea – western part
It would allow the United States forces to reach Japan more quickly and not expend the time, manpower, and supplies to capture every Japanese-held island on the way. It would give the Allies the advantage of surprise and keep the Japanese off balance.
This strategy was possible in part because the Allies used submarine and air attacks to blockade and isolate Japanese bases, weakening their garrisons and reducing the Japanese ability to resupply and reinforce them. Thus troops on islands which had been bypassed, such as the major base at Rabaul, were useless to the Japanese war effort and left to "wither on the vine."