Answer:
For the first time, the United States would police disputes between Latin American and European governments
Step-by-step explanation:
The Roosevelt Corollary was a major change to the Monroe Doctrine, because "For the first time, the United States would police disputes between Latin American and European governments."
This is evident when the corollary states that the United States would police disputes between the Latin American and European governments to enforce legitimate claims of the European powers, instead of a situation in which the European governments would express their claims directly.