The Monroe Doctrine was a policy by James Monroe basically warning European countries from attempting to further colonize the Western Hemisphere. Not to mention, it failed.
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Arizona became a state on February 14, 1912.
The <span>Roosevelt Corollary was an addition to the Monroe Doctrine, issued by President Monroe, which stated that any further encroachment by European countries in the Americas would be seen as an act of aggression. </span>
