Answer:
Europe's Invasion of Latin America.
Explanation:
The Monroe doctrine advocated for the existence of two separate spheres of influences: Europe, where the United States would not get involve, and the Americas, where European Powers should not get involved.
When the Monroe Doctrine was formulated by president James Monroe in 1823, the United States did not have a powerful navy yet, and for years, it was the British Empire the sole enforcer of the doctrine. Had the great European powers of the time decided to invade the Americas, the United States would not likely have prevented it.
