In 1910, Japan formally annexed Korea. This was not a sudden strike — it was the final step in a slow takeover that had been building since the Russo-Japanese War of 1904-05.
Korea had been a Japanese protectorate since 1905, when Japan forced the Eulsa Treaty on Emperor Gojong and took control of Korea's foreign affairs. By 1910, Japan simply removed the last layer of Korean sovereignty. The Korean Empire ceased to exist. It became a Japanese colony called Chōsen, ruled by a Japanese Governor-General with total power over law, police, and the military.
Cause and consequence: why annexation happened: Japan had already beaten China (1895) and Russia (1905) for influence over Korea. With no rival power left to object, Japan simply finished the job. Annexation was the logical end point of a strategy Japan had followed for fifteen years: remove every competitor, then absorb the prize.
Colonial rule was economically extractive from the start. The Governor-General launched the Land Survey (1910-1918) — officially to modernise land ownership records, but in practice it stripped many Korean farmers of their land.
- Complicated registration rules — many peasants who had farmed common or ambiguous land for generations could not produce Western-style paperwork proving ownership, so their claims were rejected.
- Land transferred to the state and Japanese settlers — unclaimed or disputed land became government property, and much of it was then sold cheaply to Japanese companies and colonists.
- Tenancy over ownership — huge numbers of former Korean landowners became tenant farmers, paying high rents to new Japanese or Japanese-backed landlords.
- Rice exported to Japan — Korea became a rice-supplying colony; production rose, but so much was shipped to Japan that Korean per-capita rice consumption actually fell.
The historical debate: modernisation or exploitation?: Some argue Japan built railways, ports, and modern administration in Korea — genuine economic development. Others argue this development served Japan's interests only: infrastructure moved Korean resources out, not wealth in, and ordinary Koreans got poorer while colonial profits flowed to Tokyo and to Japanese settlers. A strong essay uses both sides: yes, structures were modernised — but ownership, profit, and control stayed almost entirely Japanese. That is the key distinction between modernisation and colonial exploitation.
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By 1919, resentment at colonial rule exploded into the biggest protest movement in Korean history: the March First (Samil) Movement.
On 1 March 1919, thirty-three Korean religious and community leaders publicly read a Declaration of Independence in Seoul. Peaceful demonstrations spread within days to almost every province, drawing in students, farmers, and workers — an estimated one to two million Koreans took part over the following weeks.
Why 1919? Perspectives and timing: Timing mattered. US President Woodrow Wilson's idea of self-determination, discussed at the Paris Peace Conference, gave Korean nationalists hope the world would support independence. The recent death of former Emperor Gojong in January 1919 (rumoured to be poisoned by the Japanese) also brought huge crowds into the streets for his funeral, which nationalist organisers used as cover to launch the protests.
Japan's response was brutal. Police and military units fired on crowds, arrested tens of thousands, and used torture in prisons. Historians estimate several thousand Koreans were killed in the crackdown, and tens of thousands more imprisoned.
Did the Samil Movement fail?
- It did not win independence — Japan crushed it with force within months.
- No political change to colonial rule was granted at the time.
- Short-term, the movement looks like a costly defeat.
Did it succeed in other ways?
- It forced Japan into the 'Cultural Policy' of the 1920s — a softer, more visible approach (allowing some Korean newspapers, easing press controls).
- It united Koreans across class and region in a shared national identity.
- It inspired the founding of a Korean Provisional Government in exile in Shanghai (1919), a key symbol for later independence efforts.
Japan's 'Cultural Policy' of the 1920s proved short-lived. From the 1930s, as Japan's military became more powerful and Japan prepared for war, colonial policy hardened again — this time into forced assimilation.
- Naisen Ittai — the doctrine that 'Japan and Korea are one body', used to justify erasing Korean identity entirely rather than simply ruling Korea.
- Name-change policy (Sōshi-kaimei, 1939-40) — Koreans were pressured and often coerced into adopting Japanese names.
- Korean language banned in schools — from the late 1930s, Japanese became the only language of instruction; Korean-language newspapers were shut down.
- State Shinto worship enforced — Koreans were required to bow at Shinto shrines and pledge loyalty to the Japanese emperor, directly attacking Korean religious and cultural practice.
Link cause and consequence across the whole topic: Notice the pattern: Samil (1919) was a consequence of harsh early colonial rule, and it was itself a cause of the 1920s Cultural Policy — which then reversed into worse assimilation in the 1930s as Japan militarised for war. A strong essay traces this chain of cause and consequence rather than listing events in isolation.
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The Second Sino-Japanese War began in 1937, and it transformed Korea from an exploited colony into a total-war resource base. Every part of Korean life was mobilised for Japan's war effort.
Forced labour
From 1939, the National General Mobilization Law let Japan conscript Korean civilians to work in mines, factories, and construction sites in Korea, Japan, and occupied territories. Conditions were harsh and often deadly; historians estimate hundreds of thousands to over a million Koreans were forced into labour.
Military conscription
Korean men were first recruited, then from 1944 formally conscripted into the Japanese Imperial Army, fighting and dying for the power that had colonised them.
'Comfort women'
Japan's military ran a system of 'comfort women'. Tens of thousands of Korean women and girls were deceived or coerced into this system — one of the most painful and contested legacies of the occupation, still debated between Japan and Korea today.
Total war meant total extraction: labour, soldiers, and women's bodies were all mobilised for Japan's war machine.
Wartime demands went further still: rice, metal (even temple bells and cooking pots), and industrial output were requisitioned. Korean farmers who had already lost land in the 1910s now lost their harvests to the war economy too.
Historical debate: how big was the war's impact?: Some historians stress that wartime mobilisation was the harshest phase of the entire colonial period — worse than the 1910s or 1920s, because it touched almost every Korean family through conscription, labour, or requisition. Others note that Japan's surrender came suddenly in August 1945, meaning Korea's liberation was not the result of Korean resistance defeating Japan, but of the atomic bombs and Soviet entry into the war against Japan. This matters for judging significance: Korea gained freedom, but not through its own victory — which shaped how unprepared and divided Korea was for independence.
That lack of preparation is exactly why the war years also planted the roots of Korea's later division. Decades of independence activism abroad had produced two very different leaders, based in two very different places.
| Kim Il Sung | Syngman Rhee | |
|---|---|---|
| Base during occupation | Fought as a guerrilla commander against Japan in Manchuria, then took refuge in the Soviet Union | Lived mostly in exile in the United States, lobbying Western governments for Korean independence |
| Political leaning | Communist, backed by the Soviet Union | Anti-communist, backed by the United States |
| Base of support | Northern Korea, Soviet-trained guerrilla networks | Southern Korea, conservative and Western-educated elites |
| Later role | Founded North Korea (1948), ruled until his death in 1994 | Founded South Korea (1948), its first president |
Significance: why this rivalry matters for 1945 onward: Kim Il Sung and Syngman Rhee did not create the division of Korea alone — that came from the Soviet-US occupation zones agreed at the end of the war. But their pre-existing rivalry, radically different ideologies, and separate foreign backers meant Korea had no single, unified independence leadership ready to take over in 1945. When Japan surrendered suddenly, Korea was left with two competing nationalist camps already primed to become two rival states — a direct root of the division that led to the Korean War in 1950.