Answer:
It served as a precedent for hemispheric domain in American foreign policy.
Step-by-step explanation:
Monroe Doctrine was a U.S. policy, opposing European colonialism in America. As textually says: "the manifestation of an unfriendly disposition toward the United States.". Also, this Doctrine also will respect and recognise all colonies that are already settle in the America.
So, basically Monroe Doctrine was to ensure a foreign policy against Europe.