South Korea–United States relations

The diplomatic, military, and economic relationship between South Korea and the United States, shaped by the Korean War, their alliance, and extensive trade.

Mutual Defense Treaty between the United States and the Republic of Korea: A 1953 treaty committing the United States and South Korea to consult and act against common armed attacks. The treaty is the formal foundation of their security alliance.
Japanese rule over Korea: The period from 1910 to 1945 when the Korean Peninsula was governed as part of the Japanese Empire. Its end created the conditions for Korea’s division and U.S. involvement.
United States–Korea Free Trade Agreement: A trade agreement between the United States and South Korea that entered into force in 2012. It structures trade access and economic ties between the allies.
South Korea–China relations: The diplomatic, economic, and security relationship between South Korea and China. South Korea’s deep economic ties with China complicate alignment with Washington.
Korean Demilitarized Zone: A buffer zone established by the 1953 armistice that separates North and South Korea. The alliance operates in the tense security environment created by this dividing line.
United States Forces Korea: The U.S. military command responsible for forces stationed in South Korea. Its presence gives the alliance a standing military dimension.
Division of Korea: The post-1945 partition of the Korean Peninsula into Soviet- and U.S.-occupied zones, later consolidated into rival states. The division made the U.S. role in southern Korea a lasting strategic commitment.
South Korea–United States economic relations: The trade, investment, and financial links between South Korea and the United States. Economic interdependence is a major pillar alongside security cooperation.
South Korea–Japan relations: The diplomatic, economic, and security relationship between South Korea and Japan. Historical disputes and growing security cooperation test the U.S.-backed trilateral agenda.
South Korea’s defense industry: The South Korean industry that develops and produces military equipment and technology. Alliance cooperation and dependence have influenced South Korea’s drive for defense capabilities.

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