The significance of the Open Door Policy for the United States lay in its (A) providing a use for the Philippines as a way station between China and the United States (B) moving the American public away from isolationism and toward the view of the nation as a world power (C) keeping Japan from annexing Formosa (D) guarantees from leasehold nations that they would keep their Chinese ports open to all nations (E) obtaining the right to build a railroad in China

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I'm pretty sure the answer is D

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