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More information about the Republic of Korea is available on the Republic of Korea and from other Department of State publications and other sources listed at the end of this fact sheet.


The United States and Korea’s Joseon Dynasty established diplomatic relations under the 1882 Treaty of Peace, Amity, Commerce, and Navigation, and the first U.S. diplomatic envoy arrived in Korea in 1883. U.S.-Korea relations continued until 1905, when Japan assumed direction over Korean foreign affairs. In 1910, Japan began a 35-year period of colonial rule over Korea. Following Japan’s surrender in 1945, at the end of World War II, the Korean Peninsula was divided at the 38th parallel into two occupation zones, with the United States in the South and the Soviet Union in the North. Initial hopes for a unified, independent Korea were not realized, and in 1948 two separate nations were established — the Republic of Korea (ROK) in the South, and the Democratic People’s Republic of Korea (DPRK) in the North. In 1949, the United States established diplomatic relations with the Republic of Korea.

On June 25, 1950, North Korean forces invaded the ROK. Led by the United States, a United Nations coalition of 16 countries undertook its defense. Following China’s entry into the war on behalf of North Korea later that year, a stalemate ensued for the final two years of the conflict until an armistice was concluded on July 27, 1953. A peace treaty has never been signed. In 1953, at the conclusion of the Korean War, the United States and the Republic of Korea signed a Mutual Defense Treaty, the foundation of a comprehensive alliance that endures today.

In the decades after the war, the ROK experienced political turmoil under autocratic leadership, but developed a vocal civil society that led to strong protests against authoritarian rule. Pro-democracy activities intensified in the 1980s, beginning with the Gwangju Democratization Movement in May 1980, eventually leading to the ROK’s transition to what is now a vibrant democracy.

The United States and the ROK share a long history of cooperation based on mutual trust, shared values of democracy, human rights, and the rule of law, common strategic interests, and an enduring friendship. The two countries work together to combat regional and global threats and to strengthen their economies. The United States has maintained Army, Air Force, Navy, and Marine personnel in the ROK in support of its commitment under the U.S.-ROK Mutual Defense Treaty to help the ROK defend itself against external aggression. In 2020, the two countries commemorated the 67th anniversary of the U.S.-ROK Alliance and the 70th anniversary of the outbreak of the Korean War. A Combined Forces Command coordinates operations between U.S. Forces Korea and ROK armed forces. The United States and the ROK continue to coordinate closely on respective engagements with the DPRK, the implementation of sanctions, and inter-Korean cooperation. As the ROK’s economy has developed (it joined the OECD in 1996), trade and investment ties have become an increasingly important aspect of the U.S.-ROK relationship, including through implementation of the amended Korea-U.S. Free Trade Agreement (KORUS FTA).

In recent years, the U.S.-ROK Alliance has expanded into a deep, comprehensive global partnership, and the ROK’s role as a regional and global leader continues to grow, as evident most recently as a successful model for other countries around the world on COVID-19 response. In the early months of the pandemic, the United States and the ROK collaborated to establish robust travel screening measures to preserve air linkages. The ROK has donated essential medical supplies to the United States, including 2.5 million protective masks, and facilitated the purchase of 750,000 COVID-19 tests. U.S. and ROK experts and policymakers regularly share best practices on fighting COVID-19. In 2019 the ROK committed maritime assets in the Strait of Hormuz and committed to share information with the International Maritime Security Construct. The ROK is a major donor and leader in development efforts, including health security, women’s empowerment, and humanitarian assistance. The U.S. and the ROK hold an annual Senior Economic Dialogue, where policymakers from both sides coordinate on economic issues and advance regional economic cooperation under the U.S. Indo-Pacific Strategy and the ROK’s New Southern Policy.

The emergence of the ROK as a global leader has also led to an increasingly dynamic U.S.-ROK Alliance focused on future-oriented partnership opportunities including space, energy, health, climate change, and cyber. The United States and ROK renewed in 2015 the Civil Nuclear “123” Agreement and maintain a High-Level Bilateral Commission to address civil nuclear issues of mutual interest. The two countries signed in 2016 a Civil Space Framework Agreement to increase cooperation in civil space exploration, and we hold biennial cabinet-level Joint Committee Meetings on science and technology. The comprehensive U.S.-ROK Science and Technology Agreement (STA) has facilitated mutually beneficial scientific cooperation. The ROK is an active partner on efforts to combat illegal, unregulated, and unreported fishing, and has established a World Fisheries University.

People-to-people ties between the United States and the ROK are a central pillar of our multifaceted relationship. The ROK is third in absolute terms (and first per capita) as a source of international students attending U.S. colleges and universities. Educational exchanges include a robust Fulbright exchange program, as well as the Work, English, Study, and Travel (WEST) program that gives a diverse group of Korean students and young leaders the opportunity to learn more about the United States.

Underscoring the strength of the U.S.-ROK Alliance, President Moon’s first overseas trip after his May 2017 inauguration was to the United States in June 2017. In November 2017, President Trump became the first U.S. president to make a state visit to the Republic of Korea in 25 years, although previous presidents Obama, Bush, and Clinton all made several non-state visits to the ROK during that period.

U.S. Assistance to the Republic of Korea

The United States provides no development assistance to the ROK. The ROK, once a recipient of U.S. assistance in the years after the Korean War, has become a donor of development aid to other countries.

Bilateral Economic Relations

Over the past several decades, the ROK has achieved a remarkably high level of economic growth and in 2019 was the United States’ sixth-largest goods trading partner. Major U.S. firms have long been leading investors and the United States was the ROK’s second largest source of foreign direct investment in 2018, according to the International Monetary Fund. U.S. foreign direct investment in the ROK accounted for $39.1 billion inward FDI stock in 2019. The two countries reached $168.6 billion in trade in 2019, with large-scale flows of manufactured goods, agricultural products, services, and hi-tech goods. ROK foreign direct investment in the United States continues to grow and has more than tripled since 2011 from $19.7 billion to $61.1 billion in 2019 on a historical-cost basis by country of ultimate beneficial owner, making the Republic of Korea the second-largest Asian source of foreign direct investment into the United States. In the last three years, Korean companies have made major investment announcements in automotive components, industrial equipment, consumer electronics, and other sectors. The KORUS FTA entered into force on March 15, 2012, underscoring the depth of bilateral trade ties. The United States and ROK negotiated modifications and amendments to KORUS in 2018, and the updated agreement entered into force on January 1, 2019.

The Republic of Korea’s Membership in International Organizations

The ROK and the United States belong to a number of the same international organizations, including the United Nations, G-20, Organization for Economic Cooperation and Development, Asia-Pacific Economic Cooperation forum, Association of Southeast Asian Nations (ASEAN) Regional Forum, International Monetary Fund, World Bank, and World Trade Organization. The ROK hosts the Green Climate Fund, an international organization associated with the United Nations Framework Convention on Climate Change. The ROK also is a Partner for Cooperation with the Organization for Security and Cooperation in Europe and an observer to the Organization of American States.

Bilateral Representation

Principal Embassy officials are listed in the Department’s Key Officers List.

The ROK maintains an embassy  in the United States at 2450 Massachusetts Avenue NW, Washington, DC 20008 (tel. 202-939-5600).

More information about South Korea is available from the Department of State and other sources, some of which are listed here:

CIA World Factbook South Korea Page 
International Travel Information for South Korea
U.S. Embassy
U.S. Consulate in Busan
Embassy of the Republic of Korea in Washington, DC 
U.S.-Republic of Korea Free Trade Agreement 
U.S. Forces Korea 
Office of the U.S. Trade Representative Countries Page 
U.S. Census Bureau Foreign Trade Statistics International Offices Page 
Library of Congress Country Studies 
Travel Information

U.S. Department of State

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