What was the name of the official United States policy that held that the United States would not tolerate European military involvement in the Western Hemisphere?

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The Monroe Doctrine was a policy that was first declared in 1823 by President James Monroe, which stated that the United States would not tolerate any European military involvement in the Western Hemisphere. The doctrine became the cornerstone of U.S. foreign policy towards Latin America and has been invoked by various U.S. presidents over the years to justify interventions in the region.

What Was the Name of the Official United States Policy