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1823 President James Monroe delivers his annual message to Congress, introducing the Monroe Doctrine.

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1823 President James Monroe delivers his annual message to Congress, introducing the Monroe Doctrine.

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Asserted that the Western Hemisphere was off-limits to further European colonization and intervention, marking a significant shift in U.S. foreign policy.

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1824 The United States engages in diplomatic relations with newly independent Latin American countries.

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1824 The United States engages in diplomatic relations with newly independent Latin American countries.

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Demonstrated U.S. support for independence movements in Latin America and set a precedent for future diplomatic relations.

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1845,The concept of Manifest Destiny emerges, reinforcing the Monroe Doctrine’s principles.

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1845,The concept of Manifest Destiny emerges, reinforcing the Monroe Doctrine’s principles.

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Justified westward expansion and U.S. intervention in the Americas, as it was viewed as a moral obligation to spread democracy.

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1898 The Spanish-American War results in the U.S. acquiring territories in the Caribbean and the Pacific.

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1898 The Spanish-American War results in the U.S. acquiring territories in the Caribbean and the Pacific.

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The war exemplified the Monroe Doctrine’s enforcement, as the U.S. took a more active role in international affairs and colonialism.

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1904,President Theodore Roosevelt expands the Monroe Doctrine with the Roosevelt Corollary.

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1904,President Theodore Roosevelt expands the Monroe Doctrine with the Roosevelt Corollary.

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Asserted the U.S. right to intervene in Latin America to maintain stability, further establishing U.S. influence in the region.