A border drawn in five weeks

When Britain left **India** in 1947, it split the subcontinent in two. The man given the job, Cyril Radcliffe, was a London lawyer who had never set foot in India and was handed about five weeks to draw a line through one of the most crowded, intermixed places on Earth. That hurried border — the Radcliffe Line — still shapes the lives of nearly two billion people.

A line by religion

The idea was to separate Muslim-majority from Hindu-majority areas: the Muslim-majority regions in the northwest and northeast became **Pakistan**; the rest became **India**. But faith is not tidy on a map. Across the great **Indo-Gangetic Plain**, Hindus, Muslims and Sikhs lived in the same provinces, the same cities, often the same streets — and a single line could not cleanly divide them.

Claim (consensus): Partition sought to separate Muslim-majority and Hindu-majority areas, but the intermixed population of the northern plains meant no single line could divide the communities cleanly.

A country in two pieces

Geography dealt Pakistan a strange birth: it was created in **two wings** — West Pakistan on the Indus, and East Pakistan on the Ganges delta — separated by 1,600 km of hostile Indian territory. A single nation split by the width of its rival is almost impossible to hold, and in 1971 the eastern wing broke away to become **Bangladesh**. The map had built the fracture in from the start.

Claim (consensus): Pakistan was created in two wings separated by ~1,600 km of India; this geographic split was a central factor in East Pakistan's 1971 secession as Bangladesh.

The two provinces cut in half

The line fell hardest on two provinces: **Punjab** in the west and **Bengal** in the east, both split down the middle. It ran through irrigation systems, farmland, road and rail networks and family villages, severing the **Indus** and **Ganges** plains that had functioned as wholes for millennia. Overnight, neighbours found themselves on the wrong side of a border.

Claim (consensus): The Radcliffe Line partitioned the integrated Punjab and Bengal regions, cutting through irrigation, transport and farmland systems on the Indus and Ganges plains.

The largest migration in history

What followed was one of the largest and most violent movements of people ever recorded. As the line was announced, roughly **15 million** people fled across it — Muslims toward Pakistan, Hindus and Sikhs toward India — and in the chaos, estimates of the dead run from several hundred thousand up to a million. A border drawn in weeks uprooted a subcontinent in months.

Claim (consensus): Partition triggered the migration of an estimated 15 million people and hundreds of thousands to around a million deaths — among the largest and deadliest forced migrations in history.

The knot left untied

One piece was left dangling: **Kashmir**, a Muslim-majority princely state with a Hindu ruler, high in the mountains where the **Indus** headwaters rise. Its ruler's choice to join India, disputed by Pakistan, lit the first India–Pakistan war within months — and Kashmir has been the fault line of every conflict between them since. Partition's one unfinished line became its most dangerous.

Claim (consensus): Kashmir's unresolved accession at Partition — a Muslim-majority state with a Hindu ruler, holding the Indus headwaters — began the India–Pakistan conflict and remains its central dispute.

What haste drew

A subcontinent cut apart in five weeks produced two nuclear-armed rivals, a country split in two that later broke in three, the largest migration in human history, and a mountain dispute still unresolved after eighty years. Partition is the clearest case of how a line drawn in haste across intricate human geography can echo for generations — the map made quickly, the consequences paid slowly.