Japan and the Korean Empire signed the Japan–Korea Treaty of 1905 (often called the Eulsa Treaty), which stripped Korea of independent control over foreign relations. This treaty created the position of a Japanese Resident-General and marked a major step toward full annexation. It set the stage for tighter political and administrative control in the years that followed.
The Japan–Korea Treaty of 1907 deepened Japanese authority by placing Korea’s internal affairs under Japanese guidance. It further reduced the Korean government’s ability to govern independently. This institutional shift helped Japan move from indirect influence to direct rule.
Japanese and Korean representatives sealed the Japan–Korea Annexation Treaty, formalizing Japan’s plan to annex Korea. Although later contested in legitimacy by many Koreans and later governments, it was used by Japan to justify ending Korean sovereignty. This was the legal mechanism Japan cited for establishing colonial rule.
The annexation took effect, and Japan established the Government-General of Chōsen to administer Korea as a colony. The Governor-General held sweeping powers over policing, administration, and policy. This centralized colonial structure shaped daily life and governance in Korea through 1945.
A mass protest movement for Korean independence began on March 1, 1919, starting in Seoul and rapidly spreading across the country. Demonstrations were largely nonviolent but were suppressed with force, leading to many deaths and arrests. The movement became a major turning point by strengthening organized independence efforts and drawing international attention.
Korean independence leaders established the Provisional Government of the Republic of Korea in Shanghai as a government-in-exile. It aimed to coordinate independence activism and represent Korea internationally. Over time, it became an important political center for resistance networks outside the peninsula.
After the Great Kantō earthquake in Japan, false rumors fueled mob and official violence against ethnic Koreans. Thousands of Koreans were killed in the Kantō region over the following weeks. The massacre worsened fear and insecurity for Koreans across the Japanese empire and remains a major historical trauma tied to colonial-era racism.
Student-led protests against Japanese rule expanded into a nationwide movement, starting with demonstrations in early November 1929. The movement showed how youth and schools had become key sites of resistance under colonial rule. Japan’s harsh response also highlighted the limits of political space for Koreans in the colonial system.
Japan passed the National (State General) Mobilization Law to reorganize society and the economy for total war. The law enabled wide state control over labor, industry, and media across the Japanese empire. It helped intensify pressures in colonial Korea for production, surveillance, and later forced mobilization.
The Government-General introduced policies pressuring Koreans to adopt Japanese-style names, known as sōshi-kaimei. While presented as administrative reform, it was widely experienced as forced assimilation aimed at weakening Korean identity. Compliance was pushed through administrative pressure during the 1940 implementation period.
The Korean Provisional Government announced the formal creation of the Korean Liberation Army in China. The force sought to contribute to Allied efforts against Japan and to strengthen Korean claims to independence after the war. Its establishment linked the independence movement more directly to the wider Second World War conflict.
Japanese police arrested members of the Korean Language Society in 1942, accusing them under security laws and subjecting many to harsh interrogation and imprisonment. The society was associated with research on Korean language and orthography, and the crackdown reflected intensified wartime control over culture. The incident became a lasting symbol of repression tied to language and identity under colonial rule.
Japan accepted defeat in World War II, a turning point that ended Japan’s colonial rule over Korea. Koreans later marked August 15 as Liberation Day (Gwangbokjeol), remembering it as the end of 35 years of formal colonial rule. The surrender created a sudden political vacuum and immediate questions about how Korea would be governed next.
U.S. forces arrived in Korea and established the United States Army Military Government in Korea shortly afterward. This occupation followed Japan’s surrender and coincided with the peninsula’s division into Soviet and American zones along the 38th parallel. The post-liberation settlement shaped Korea’s immediate transition out of colonial rule and set conditions for later political division.
Japanese rule in Korea (1910-1945)