Final answer:
The Monroe Doctrine was the American policy meant to keep European countries from getting involved in North and South America.
Step-by-step explanation:
The American policy that was meant to keep European countries from getting involved in North and South America was the Monroe Doctrine. The Monroe Doctrine, issued in 1823 by President James Monroe, stated that any further colonization or interference by European powers in the Americas would be seen as a hostile act towards the United States. It aimed to establish the United States as the dominant power in the Western Hemisphere and prevent European influence and expansion in the region.
Learn more about American policy to prevent European involvement in the Americas