Partition of India and Pakistan
August 1947: British India was divided into two independent nations in a matter of weeks. The complete guide — why it happened, how the Radcliffe Line was drawn, the 14 million displaced, and what it means for Pakistan today.
Last updated: 11 October 2026
The Essentials
Key Facts at a Glance
The Partition in thirty seconds.
The Causes
Why Partition Happened
Partition was not an accident — it was the outcome of decades of politics, accelerated by a British decision to leave in a hurry.
The Two-Nation Theory
The ideological engine of Partition was the Two-Nation Theory: the argument, pressed by Muhammad Ali Jinnah and the All-India Muslim League, that Muslims and Hindus of the subcontinent were two separate nations, not one — distinct in religion, culture, law and historical memory — and that Muslims therefore needed a homeland of their own. The theory gained unstoppable momentum after the 1946 provincial elections, in which the Muslim League won the overwhelming majority of Muslim-reserved seats, and after the Direct Action Day violence in Calcutta in August 1946 showed how far communal relations had deteriorated.
Britain’s rush to the exit
By early 1947 Britain was exhausted — financially drained by the Second World War and facing a restive subcontinent. The new Viceroy, Lord Mountbatten, arrived in March 1947 with orders to get Britain out. On 3 June 1947 he announced the Mountbatten Plan: British India would be divided into two independent dominions, India and Pakistan, with power transferred on 15 August 1947 — barely ten weeks later. The original British plan had envisaged withdrawal by June 1948; Mountbatten advanced it by nearly a year. Parliament then passed the Indian Independence Act, which received royal assent on 18 July 1947, giving the plan legal force.
The Countdown
Timeline: The Five Weeks That Drew the Map
From plan to two nations in seventy-three days.
| Date | Event |
|---|---|
| 3 June 1947 | Mountbatten Plan announced; leaders agree to divide British India |
| 18 July 1947 | Indian Independence Act receives royal assent in London |
| 8 July 1947 | Cyril Radcliffe arrives in India to chair the boundary commissions |
| 14 August 1947 | Pakistan becomes independent — Jinnah’s address in Karachi ends “Pakistan Zindabad” |
| 15 August 1947 | India becomes independent at midnight; Nehru’s “tryst with destiny” speech |
| 17 August 1947 | The Radcliffe Line is published — two days after independence, three days after Pakistan’s |
Note the cruel detail: both countries celebrated independence without knowing where their borders were. The boundary award was kept secret until 17 August — partly, historians argue, to avoid spoiling the independence celebrations with the inevitable disputes. Millions woke up as citizens of new nations whose frontiers were still ink on a British lawyer’s desk.
The Border
The Radcliffe Line
Drawn by a man who had never been to India, in five weeks, without meeting the leaders whose countries he was dividing.
Cyril Radcliffe
A distinguished British judge with no experience of India or boundary-making. Mountbatten chose him precisely because he had no local ties — “impartiality” that became ignorance of the ground.
Five Weeks
Radcliffe arrived on 8 July and had to divide Punjab and Bengal — provinces of tens of millions — by mid-August. He later said two to three years would have been realistic.
17 August 1947
The award was published two days after independence. The line split villages, farms, rivers — and the cities of Lahore (Pakistan) and Amritsar (India).
The commissions worked on a simple, brutal principle: contiguous Muslim-majority areas to Pakistan, non-Muslim-majority areas to India — with “other factors” allowed. In practice the “other factors” were political dynamite. Radcliffe initially awarded Ferozepur to Pakistan, but Mountbatten intervened and it went to India; Gurdaspur — the district giving India its only road access to Kashmir — also went to India, a decision Pakistan has contested ever since. Lahore, Radcliffe reportedly mused, nearly went to India — but Pakistan, having lost Calcutta, needed a great city. For more on how the line was drawn, see our Partition of India guide.
The Human Cost
The Great Migration
The largest forced migration in human history — and one of its bloodiest.
Muslims moving west and east to Pakistan; Hindus and Sikhs moving to India — the 1951 census counted 7.226 million Muslims entering Pakistan and 7.249 million Hindus and Sikhs leaving.
Estimates of the dead vary enormously; around one million is the most commonly cited figure. Refugee trains were attacked; entire villages were emptied.
Tens of thousands of women were abducted or assaulted — a wound both countries’ recovery programmes spent years trying to address.
The migration defined Pakistan’s demography. Karachi — then a city of under half a million, nearly half of them Hindu — absorbed over half a million Muslim refugees almost overnight, transforming it into the Urdu-speaking metropolis it remains. Lahore, too, was remade. The refugee experience — the muhajir identity — became a permanent thread in Pakistani politics and culture, shaping everything from Karachi’s language map to national elections decades later.
The Unfinished Business
The Princely States
Partition divided British India — but 565 princely states had to choose for themselves.
The Mountbatten Plan gave the princely states a choice: join India or Pakistan. Most chose quickly. Three did not — and each became a crisis. Kashmir, with a Hindu Maharaja and a Muslim-majority population, acceded to India in October 1947 after a tribal invasion from Pakistan’s side — the origin of a dispute that has caused three wars and remains unresolved. Hyderabad, the richest princely state, tried to stay independent until India absorbed it by force in Operation Polo (September 1948). Junagadh, with a Muslim ruler and Hindu-majority population, acceded to Pakistan but was integrated into India after a plebiscite. Kashmir, notably, was not part of the Radcliffe decision at all — the line stopped at the princely borders, leaving the hardest question for war and diplomacy.
Today
Partition’s Legacy for Pakistan
1947 is not history in Pakistan — it is the operating system.
Every major theme of Pakistani public life runs back to Partition. The Two-Nation Theory remains the state’s founding narrative, taught in every classroom and invoked in every Independence Day address. The Radcliffe Line’s ambiguities — Gurdaspur, Ferozepur, the hasty Punjab division — feed the Kashmir dispute and the permanently militarised eastern border. The muhajir identity forged in the refugee columns still shapes Karachi’s politics, from the 1969 province demand to today’s MQM-P. And the constitutional order — an Islamic republic with equal citizenship — is the ongoing attempt to answer the question Partition posed: what does it mean for Muslims to have a homeland of their own?
Remembering Partition
How Partition is remembered has itself become a field of history. Amritsar’s Partition Museum (opened 2016) preserves refugee testimonies and belongings; writers from Saadat Hasan Manto — whose 1947 stories remain the starkest literary record of the violence — to Khushwant Singh (Train to Pakistan) gave the migration its literature; and oral-history projects on both sides now race to record the last survivors. In Pakistan, 14 August is celebrated as Independence Day — a triumph — while the migration’s trauma is carried privately, in family stories. Both registers are true: Partition was a liberation and a catastrophe, and Pakistan lives inside both meanings.
Read how that answer was written into law in our guide to the 1973 Constitution, and how the first capital years unfolded in Karachi as Pakistan’s first capital.
Answers
Frequently Asked Questions
The questions people ask most about the Partition.
When did the Partition of India happen?
In August 1947. Pakistan became independent on 14 August 1947 and India on 15 August 1947, under the Indian Independence Act passed by the British Parliament in July 1947.
Why was India partitioned?
Because of the Two-Nation Theory — the Muslim League’s argument, led by Muhammad Ali Jinnah, that Muslims and Hindus were two separate nations needing separate homelands — combined with Britain’s decision to withdraw quickly. The Mountbatten Plan of 3 June 1947 turned the theory into a timetable: two dominions, independence by 15 August.
Who drew the border between India and Pakistan?
Sir Cyril Radcliffe, a British judge who had never visited India. He chaired the boundary commissions for Punjab and Bengal, was given five weeks, and his award — the Radcliffe Line — was published on 17 August 1947, two days after independence.
How many people died during Partition?
Estimates range from 200,000 to 2 million; around one million is the most commonly cited figure. The true number will never be known — the violence was too widespread and too poorly recorded.
How many people migrated during Partition?
14–15 million — the largest forced migration in recorded history. The 1951 census counted 7.226 million Muslims moving to Pakistan and 7.249 million Hindus and Sikhs moving to India.
What is the Radcliffe Line?
The boundary line dividing British Punjab and Bengal between India and Pakistan, named after its architect Cyril Radcliffe. It remains the basis of the India–Pakistan border in Punjab and parts of Rajasthan.
Why is Kashmir disputed after Partition?
Kashmir was a princely state, not part of British India, so the Radcliffe Line did not cover it. Its Hindu Maharaja acceded to India in October 1947 after an invasion from the Pakistani side — a decision Pakistan has never accepted, leading to wars in 1947–48, 1965 and 1999 and an unresolved UN dispute.
Explore Pakistan’s History
From 1947 to today — the events, people and turning points that made the country.
Feature Pakistan’s Pakistan Guides explain the country’s history in plain language — written for students, aspirants and curious citizens, verified against historical records. Death tolls and migration figures for Partition vary across sources; this page gives the ranges historians use.