Why did the monroe doctrine become important?

Question: Why did the monroe doctrine become important!?
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The Monroe Doctrine was effectively an announcement by the United States that they would stay out of conflicts between European powers so long as the conflict did not occur in North or South America, as well as an announcement that they would interfere in any action a colonial power took against a nation in North or South America!. The most immediate effect of it was that it created the sense of entitlement among Americans that became known as Manifest Destiny, and pretty efficiently prevented the other major powers of the world from trying to stop it!. Later on, many Central and South American colonies used it as a shield to protect themselves against the pressures of their homelands and eventually split from them!. During the Cold War, it was a major rationale behind the US's view of the Cuban Missile Crisis!. Cuba's turn to a communist regime made it both a thorn in the US side as per the Monroe Doctrine, as well as a threat to make other Central and South American nations problems!. The various interpretations of the Monroe Doctrine also were key to the justification and debate over the Iran-Contra Affair, the invasion of Grenada, US involvement in the El Salvador Civil War, and the US position on the Falkland Islands War!.Www@QuestionHome@Com