I really need help on this one!
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The Monroe Doctrine.

The monroe doctrine says that Europeans, and for that matter, all foreign powers, should not interfere in the western hemisphere (north america and south america). This is similar to the threat posed by Cuba, as they were being supported by the USSR (Europe/Asia).

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.