In 1910 the Empire of Japan completed the formal takeover of the Korean Empire by signing a treaty that made Korea part of Japan. This event is commonly described as the annexation of Korea. In Japanese sources it is sometimes referred to as 日韓併合, 朝鮮併合, or 日韓合邦 — phrases that are variously translated as annexation of Korea, annexation of Joseon, or unification of Japan and Korea. The term Joseon refers to the historic Korean polity and is written Joseon here for clarity.

Background

During the first decade of the 20th century Japan increased its political and military influence on the Korean peninsula. After military victories and diplomatic pressure, Japan established effective control over Korean foreign affairs and institutions, reducing the Korean monarchy's independence in the years before 1910. These developments set the stage for the final legal act of incorporation.

The 1910 treaty and administration

The instrument that brought Korea under Japanese sovereignty is usually dated to 1910 and marked the end of Korea's status as an independent empire. Once annexed, Korea was administered directly by Japanese authorities and integrated into Japan's imperial governance structures. Japanese officials, laws, and institutions dominated government, education, and the economy throughout the colonial period.

Names, language and contested interpretations

Contemporary and later accounts use different words to describe the event. Japanese-language names for the action are sometimes rendered in English as annexation or unification; historians debate the legal, political and moral character of the treaty and of Japan's rule. Korean and international perspectives on the annexation have been shaped by the circumstances under which the agreement was made and by subsequent policies enacted during the period of Japanese control.

End of rule

Japan's governance over Korea ended with Japan's defeat in World War II. Following the war, decisions made at the Potsdam Conference and Japan's surrender led to the end of Japanese administration on the peninsula. The occupation that followed was carried out by Allied powers, and Korea's political future moved toward division and eventual establishment of separate governments in the north and south.

Aftermath and legacy

  • The period of Japanese control left long-lasting effects on Korea's political structures, economy, and society.
  • Debates over historical responsibility, reparations, and the interpretation of events remain politically and emotionally charged.
  • Scholarship continues to examine issues such as legal legitimacy, the experiences of Koreans under colonial rule, and the international context of East Asian imperial expansion.

For language and historical references, note that some sources describe the event using the Japanese term for annexation and that discussions of this period often refer to Japanese administrative policies and their consequences for Korean society. The role of Japanese officials in governing Korea is widely discussed in historical literature; see material describing how Japanese law and administration were applied in the peninsula and how occupation policies evolved until the end of the colonial period in 1945. For additional context about Japan's governance in Korea, consult resources on Japanese rule in Korea.