By 1914, the Dutch East Indies had been ruled by the Netherlands for centuries. But a new generation of Indonesians was starting to ask a dangerous question: why should a small European country rule millions of Southeast Asians?
The First World War (1914–18) sped this up. Dutch soldiers and money were tied up in Europe, colonial control loosened slightly, and ideas about self-determination — the right of a people to govern themselves — spread from Europe to the colonies. Indonesian nationalism was born in this gap.
The Indonesian Communist Party (PKI)
The Indonesian Communist Party (PKI), founded in 1920, was the first mass nationalist organisation. It grew out of a socialist study group and recruited heavily among plantation workers, railway employees and the urban poor — people already angry about low wages and Dutch exploitation.
- Cause & consequence — why the PKI grew fast: it offered a clear enemy (Dutch capitalism) and a simple promise (land and wages for the poor), which appealed to workers far more than abstract talk of independence.
- Organisation: by the mid-1920s the PKI claimed around 3,000 formal members but had far wider influence through unions and peasant networks.
- The 1926–27 revolts: local PKI branches launched uprisings in West Java (November 1926) and West Sumatra (January 1927), hoping to spark a nationwide revolution against Dutch rule.
The revolts were badly planned and quickly crushed: The PKI's national leadership was actually against an uprising in 1926 — they knew the party wasn't ready. Local branches went ahead anyway. Dutch colonial forces, tipped off in advance, arrested thousands within weeks. The revolts never spread beyond a few regions and had no real chance of success.
The Dutch response was severe and revealing. Around 13,000 people were arrested, and roughly 1,300 were exiled — many to a remote prison camp at Boven-Digoel in New Guinea, from which few ever fully returned to political life.
Significance of the PKI revolts: The 1926–27 revolts failed militarily, but they mattered hugely. They proved that ordinary Indonesians were willing to risk their lives against Dutch rule, and they showed the Dutch that repression alone could not make nationalism disappear. Historians debate whether they were a reckless failure or a necessary first shock that woke both sides up to the coming struggle.
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With the PKI smashed, a new kind of nationalism took over — not communist, but built around a broad, unifying idea of "Indonesia" as a single nation. Its leading voice was a young engineer named Sukarno.
In 1927, Sukarno founded the Indonesian Nationalist Party (PNI). Unlike the PKI, the PNI was not tied to one social class or one ideology. Sukarno blended nationalism, Marxism and Islam into a single message: unity against the Dutch mattered more than any one doctrine.
1927 — PNI founded
Sukarno and other young, Western-educated Indonesians launch the PNI, demanding full independence (not just reform) through mass, non-cooperative action.
1927–29 — rapid growth
The PNI's message of unity attracts thousands of members across Java; Sukarno becomes a genuinely popular public speaker, unusual for a colonial-era leader.
December 1929 — Dutch crackdown
Fearing another PKI-style uprising, the Dutch arrest Sukarno and other PNI leaders, accusing them of plotting rebellion.
1930 — the Bandung trial
At his trial, Sukarno turns the courtroom into a political platform, delivering his famous defence speech 'Indonesia Accuses!' — it makes him a national hero even in prison.
Founded 1927, famous by 1930 — Sukarno's real power came from being punished in public, not from ever holding office.
Sukarno was jailed until 1931, released, then re-arrested and exiled — first to Flores, later to Bengkulu — where the Dutch kept him until the Japanese invasion in 1942. This pattern of arrest-and-exile silenced nationalist leaders but never fully destroyed the movement's ideas.
PKI (Communist)
- Founded 1920 — the earliest mass movement
- Base: plantation and factory workers
- Method: 1926–27 armed revolt
- Outcome: crushed, banned, leaders exiled to Boven-Digoel
PNI (Sukarno's nationalists)
- Founded 1927 — after the PKI's failure
- Base: broad cross-class, cross-religious appeal
- Method: mass rallies, non-cooperation, public speeches
- Outcome: banned 1931, Sukarno exiled but not forgotten
Why the Dutch repression backfired in the long run: For a 'to what extent' essay, argue both sides. Repression WORKED in the 1920s–30s: it kept organised nationalist activity weak and scattered right up to 1942. But it also FAILED in the long run: it gave nationalism its martyrs (Sukarno's trial speech was reprinted and read widely), and it meant no legal, moderate path to reform ever existed — so when the chance came in 1945, the only model on offer was full, immediate independence, not gradual change.
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Everything changed in early 1942. As part of the Second World War, Japanese forces invaded the Dutch East Indies and the Dutch colonial army surrendered within weeks, on 8 March 1942. This is one of the single most important turning points in the whole story.
Cause & consequence — why the surrender mattered so much: For decades, Dutch rule had rested on an image of unbeatable European power. In 1942 an Asian army beat the Dutch on Indonesian soil in weeks. That image could never be repaired. Indonesians had seen with their own eyes that colonial rulers were not invincible — a psychological shift historians see as decisive for what followed after 1945.
But Japanese rule was not a simple gift to nationalism — it was a mixture of brutal exploitation and, at the same time, unintentional preparation for independence. A good essay must hold both truths together.
Exploitation
- Romusha (forced labour) — several hundred thousand to over a million Indonesians were conscripted to build roads, railways and airfields for Japan's war effort; conditions were brutal and death tolls were high.
- Economic extraction — rice and other resources were requisitioned for the Japanese military, causing severe shortages and famine in parts of Java by 1944–45.
- Political control — existing nationalist leaders were only tolerated where useful to Japan; independent political activity was still banned, and Japanese officials made the real decisions.
Mobilisation
- Sukarno and Hatta's collaboration — Japan released Sukarno and fellow nationalist Mohammad Hatta from exile and used them as propaganda figureheads to rally Indonesians behind the war effort, which paradoxically gave them a national public platform they'd never had under the Dutch.
- PETA (Pembela Tanah Air, 'Defenders of the Homeland') — formed by Japan in October 1943, this Indonesian volunteer militia trained roughly 35,000–37,000 young Indonesians in modern weapons and military organisation.
- Youth and language mobilisation — Japan promoted Indonesian (not Dutch) as an administrative language and organised nationalist youth groups, both of which strengthened a shared sense of Indonesian identity.
PETA's double edge: PETA was created to defend Japan's empire, not to free Indonesia — yet it is the single clearest example of occupation policy backfiring. When Japan surrendered in August 1945, it was ex-PETA officers and weapons that gave the new Republic of Indonesia the trained fighters it needed to resist the Dutch trying to reclaim the colony afterward.
By August 1945, Japan had promised eventual independence (as its war position worsened) but had not delivered it. When Japan surrendered to the Allies on 15 August 1945, Sukarno and Hatta declared Indonesian independence just two days later, on 17 August 1945 — before the Dutch could return to reclaim the colony.