Under which policy did the United States declare itself the dominant power in the Western Hemisphere?

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The Monroe Doctrine was a policy statement made by President James Monroe in 1823, which declared that any European attempts to colonize or interfere with independent states in the Western Hemisphere would be seen as a threat to the United States and would require U.S. intervention. This policy established the United States as the dominant power in the Western Hemisphere.

Under Which Policy Did the United States Declare Itself the Dominant