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Explanation:
It was successful because it allowed the protection of the United States against anyone who threaten or possessed weapons that could be used against the US.
The Monroe Doctrine was introduced in 1823 and had a lot of fascinating points. Two of the major points were, Europe could not interfere with countries in the Americas and the United States could not interfere with Europe. This played a huge part in the Western Hemisphere as Presidents would always invoke the Doctrine during foreign affairs. The most recent example, President Reagan used the Monroe Doctrine to fight and stop communism in the Americas.
Seeing one-eyed monsters would be a hallucination. Believing that you are Christopher Columbus would be a <span>delusion</span>.