us forces decided to land ob this mariana island first so that it could be used to invade the other two.

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caseysorensen · Answer

From that point on, Nimitz and MacArthur engaged in "island-hopping" amphibious drives that bypassed strongly-held islands to strike at the enemy's weak points. In an effort to liberate the people of the Philippine Islands, MacArthur pushed along the New Guinea coast with Australian allies, while Nimitz crossed the central Pacific by way of the Gilberts, Marshalls, Marianas, Carolines, and Palaus. Both campaigns would entail seemingly endless, bloody battles — ultimately leading to the unconditional surrender of the Japanese.