What effect did John Hay’s open door policy letters have on the imperial powers of Britain, France, Germany, Russia, and Japan?(1 point) Responses It warned the imperial powers that the United States would soon declare war on China. It warned the imperial powers that the United States would soon declare war on China. It caused the imperial powers to restrict trade in their trade with China. It caused the imperial powers to restrict trade in their trade with China. It signaled to those powers that the United States would take a larger role in world affairs than before.
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It signaled to those powers that the United States would take a larger role in world affairs than before.
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