How was the Roosevelt Corollary a major change to the Monroe Doctrine?

The Monroe Doctrine had been sought to prevent European intervention in the Western Hemisphere

Correct (B)  For the first time, the United States would police disputes between Latin American and European governments.

Explanation: Edgenuity Test Passed

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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