What demand did the Monroe Doctrine make regarding European colonies?

The correct answer emphasizes a significant policy established by the Monroe Doctrine, which articulated that European powers should refrain from establishing new colonies or interfering in the affairs of countries within the Western Hemisphere. This was a formative moment in the United States' approach to foreign policy, asserting a clear stance against European intervention in the Americas.

The Monroe Doctrine was announced in 1823 by President James Monroe, asserting that while the U.S. would remain neutral in European wars, any attempt by European nations to colonize or interfere with states in the Americas would be viewed as acts of aggression requiring U.S. intervention. This doctrine aimed to protect the fledgling nations in Latin America from European imperialism and established a precedent for U.S. involvement in Western Hemisphere affairs.

By clarifying that the U.S. considered the Western Hemisphere off-limits for further European colonization, it set the stage for America's future role as a regional power and reflected a growing sense of nationalism and independence from European influence.