Monroe Doctrine: This doctrine declared that any attempt by European powers to colonize or interfere with nations in the Western Hemisphere would be seen as a threat to the United States and would warrant American intervention.
Open Door Policy: This policy, advocated by the U.S. in the late 19th and early 20th centuries, aimed to ensure equal trading rights for all countries in China, preventing any one country from exerting exclusive influence over Chinese markets.
Good Neighbor Policy: Introduced by President Franklin D. Roosevelt, this policy sought better relations between the U.S. and Latin American countries through non-interventionism and mutual respect.