South Korea and the United States

A Royal Legation and a New Republic

The treaty signed on May 22, 1882, began formal ties between the United States and the Korean monarchy. An American legation followed in Seoul in 1883. Minister Bak and his staff presented King Gojong’s credentials in Washington on January 17, 1888, and opened their first office two days later. Japan’s takeover of Korea’s foreign relations in November 1905 ended independent Korean diplomacy; the American legation in Seoul closed on November 28. [1] [2]

The republic emerged from a divided liberation. After Japan’s surrender in 1945, Soviet and American forces occupied zones north and south of the 38th parallel. Rival governments developed under Kim Il Sung and Syngman Rhee, and Cold War conflict prevented the temporary division from becoming a unified settlement. North Korea’s invasion in 1950 brought American forces back under United Nations authority; Chinese intervention widened the war. The 1953 armistice stopped the fighting without resolving the peninsula’s political division. [9]

The Republic of Korea’s embassy represented the government established in Seoul after Japanese colonial rule. American recognition came on January 1, 1949. Diplomatic relations followed on March 25, when Ambassador Chang Myon presented credentials to President Harry Truman. [3]

War, Aid, and a Defense Treaty

When North Korean forces invaded in June 1950, Chang carried urgent appeals from Seoul to the White House. On June 26, he presented Truman with a Korean parliamentary resolution requesting assistance and reported President Syngman Rhee’s repeated calls about shortages of tanks, artillery, and aircraft. Truman told him that General Douglas MacArthur had been instructed to supply equipment Korean forces could use. [4]

The postwar alliance required further bargaining. The Mutual Defense Treaty was signed in October 1953. American officials also negotiated the size of Korean forces, economic assistance, procurement, and exchange rates. An agreed minute concluded on November 17, 1954, linked continued assistance to Korean cooperation in those programs. The two governments exchanged treaty ratifications in Washington on 17 November 1954, bringing the treaty into force under Article V. Rhee nevertheless protested American troop withdrawals. [5] [6] [7]

Democratic Change and Economic Interdependence

For much of the republic’s early history, the alliance operated alongside authoritarian rule. Mass protests in the 1980s helped force constitutional reform and elections in 1987, transforming the political setting in which South Koreans debated relations with Washington. Rapid industrial development also changed the balance of the partnership. The Korea–United States Free Trade Agreement, effective in 2012, provided rules and consultative machinery for an extensive commercial relationship. Disagreements over trade and the best approach to North Korea remained matters for negotiation within the alliance. [10]

Deterrence and Diplomacy Beyond the Peninsula

North Korea’s nuclear program made consultation over deterrence increasingly consequential. The Washington Declaration of April 2023 established a Nuclear Consultative Group for discussion of nuclear and strategic planning, while reaffirming South Korea’s nonproliferation obligations and the pursuit of diplomacy with Pyongyang. [11]

The same summit set out cooperation on development assistance, clean energy, digital technology, and supply chains. It also connected bilateral affairs to coordination with Japan and other regional partners. [12]

Related Reading

• The U.S.–Republic of Korea Mutual Defense Treaty [5] [6] [7]
• The Republic of Korea Establishes Relations with the United States [3]
• Korea Establishes a Legation in Washington [2]