What is the main idea of the Monroe Doctrine?

The main idea of the Monroe Doctrine is that it opposed European colonialism in the Americas. This doctrine, articulated by President James Monroe in 1823, fundamentally asserted that the Western Hemisphere was no longer open to European colonization and any attempts by European nations to interfere in the affairs of the Americas would be viewed as acts of aggression, meriting U.S. intervention. This marked a significant shift in U.S. foreign policy, aiming to protect newly independent Latin American countries from European imperialism and asserting a form of protection for the region.

The context surrounding the Monroe Doctrine highlights its importance in establishing a distinct boundary between the Americas and European powers. This was particularly relevant during a time when many Latin American countries were gaining independence from European colonial rule. By opposing European colonialism, the U.S. was positioning itself as a leader in promoting freedom and sovereignty in the Western Hemisphere.

In contrast, the other options do not reflect the primary focus of the Monroe Doctrine. The doctrine did not encourage European interference, nor was it primarily about supporting U.S. territorial expansion, although the implications of the doctrine did contribute to later U.S. expansionist policies. Additionally, it did not involve establishing trade agreements, as the core message was more about sovereignty and protection from