At its peak in 1920, the British Empire governed roughly 35.5 million square kilometres and 412 million people, about a quarter of the world's land surface and a quarter of its population. It operated on every inhabited continent. It drew borders that still define nations. It imposed a language that 1.5 billion people now speak. It built railways and extracted wealth. It abolished the slave trade and also profited enormously from it for two centuries before doing so.
Remove it entirely. No English colonial project from the late 16th century onward. England remains a prosperous but geographically contained European kingdom. What happens to the rest of the world?
Someone else takes the colonies
The uncomfortable starting point is that removing Britain from the colonial equation doesn't remove colonialism. The Portuguese, Spanish, Dutch, and French were all active colonisers before, during, and after the British. The scramble for territory was driven by economics, military competition, and genuine belief in European superiority. Britain was the most successful player, not the inventor of the game.
Without Britain, the Americas still get colonised. The Spanish and Portuguese had already claimed most of Central and South America before England established Jamestown in 1607. North America's east coast, which Britain settled from Virginia to Massachusetts, would likely have been divided between France (which already held Canada and the Mississippi basin) and the Netherlands (which held New Amsterdam, later New York). The specific character of North American colonisation changes. The outcome for indigenous populations probably doesn't.
India is the biggest question. The Mughal Empire was declining by the mid-18th century regardless of British involvement. The subcontinent's enormous wealth and weakening central authority would have attracted other European powers. The French East India Company was already competing with the British for influence. The Dutch had interests in the region. A French-dominated India is plausible. A patchwork of European-influenced successor states to the Mughals is perhaps more likely.
Africa without Britannia
The Scramble for Africa in the 1880s was a collective European project, formalised at the Berlin Conference of 1884-1885. Britain took the lion's share (a term that's unfortunately appropriate), but France, Germany, Belgium, Portugal, Italy, and Spain all grabbed territory. Remove Britain and the others divide the spoils differently. France extends further east. Germany takes more of East Africa. Belgium's horrific exploitation of the Congo still happens because that was Leopold II's personal project, independent of British actions.
The borders drawn would be different. And this matters enormously, because the arbitrary borders of colonial Africa, cutting through ethnic groups, lumping rivals together, ignoring geographic and cultural realities, are the source of conflicts that continue to this day. Different arbitrary borders would have created different conflicts. Not fewer. Just different.
South Africa without British involvement is particularly hard to predict. The Dutch settlers (Boers) were already established at the Cape by 1652. Without British conquest of the Cape Colony in 1806, the Boer republics might have consolidated into a larger Dutch-speaking settler state. The discovery of diamonds (1867) and gold (1886) would still have drawn international capital and immigration. Apartheid in some form might still have emerged, or it might not. The specific racial legislation was a product of specific political circumstances that are hard to replicate without the exact historical sequence.
The language question
English is the global lingua franca for one reason: the British Empire put it everywhere, and then American economic dominance in the 20th century kept it there. Without the British Empire, English doesn't spread beyond the British Isles (and even within them, Welsh and Scots Gaelic retain more ground).
What replaces it? French is the most likely candidate. France was the dominant cultural and diplomatic power in Europe for centuries. French was already the language of international diplomacy until the early 20th century. A world where France, not Britain, is the dominant colonial power might see French become the global default. International aviation would use French. Scientific papers would be published in French. American popular culture, if it develops similarly (which it might not, since America itself would be a different entity), might operate in Dutch or French rather than English.
Or no single language dominates. The specific historical accident of one empire spanning every continent and then being succeeded by a cultural superpower speaking the same language is a remarkable coincidence. Without it, we might live in a world of regional lingua francas: French in West Africa and parts of North America, Spanish in the Americas, Dutch or Portuguese in South and Southeast Asia, Arabic and Mandarin in their existing spheres.
No industrial revolution?
This is the most contested counterfactual. The Industrial Revolution began in Britain in the mid-18th century. Was this inevitable, or was it the product of specific British conditions?
Arguments for inevitability: the scientific knowledge existed across Europe. Coal deposits existed in Germany, Belgium, and France. Textile manufacturing was widespread. Someone would have mechanised production eventually.
Arguments against: Britain had a specific combination of factors. Cheap coal near navigable waterways. A patent system that rewarded invention. A relatively stable political environment after 1688. High labour costs that incentivised mechanisation. An empire that provided both raw materials and captive markets for manufactured goods. Colonial wealth that funded investment in new technology.
Without the empire, Britain has less capital, fewer raw materials (particularly cotton), and smaller markets. The Industrial Revolution might still begin in Britain, but later and slower. Or it begins in the Netherlands or France, which had their own capital reserves and technical knowledge. The technology spreads regardless, but perhaps decades behind our timeline.
A delay of fifty years in industrialisation means a different 19th century. Coal-powered manufacturing still transforms Europe, but the timing shifts. The social upheavals of industrialisation (urbanisation, class conflict, the labour movement) still happen, but on a different schedule and possibly in different countries first.
The Commonwealth doesn't exist
Fifty-six nations currently belong to the Commonwealth. Without the British Empire, none of them share that institutional link. There's no shared legal tradition of English common law across a quarter of the world's countries. No Westminster parliamentary model exported wholesale. No cricket. The absence of cricket alone reshapes the sporting world in ways too extensive to catalogue here, but India, Australia, the Caribbean, Pakistan, and South Africa all develop different national sports.
Legal systems diverge. Countries colonised by France would inherit the Napoleonic Code, as many already did. Dutch colonies would inherit Roman-Dutch law. The common law tradition, with its emphasis on precedent, jury trials, and adversarial procedure, remains confined to the British Isles. Whether this produces better or worse legal outcomes across the former colonies is genuinely unknowable.
International institutions look different. The United Nations still forms (the impulse toward international cooperation after two world wars would exist regardless), but the Security Council's composition changes. Britain probably isn't a permanent member if it never had an empire. France and the United States (whatever form it takes) likely are. China and Russia's positions depend on their own parallel histories.
Was the empire a net positive?
This is the question that hangs over any counterfactual about the British Empire, and I'm going to be honest about the fact that it doesn't have a clean answer.
The empire built infrastructure that still functions in former colonies. It established legal and administrative systems that endured. It spread literacy and English, which now connects a quarter of the world. It abolished the transatlantic slave trade in 1807 and spent decades enforcing that abolition through the Royal Navy.
It also caused famines that killed millions (Bengal, 1943: an estimated three million dead, with Churchill's wartime policies directly implicated). It ran concentration camps during the Boer War. It extracted wealth systematically from colonised populations for centuries. It drew borders with a ruler on a map and left the consequences for the people living there. The partition of India in 1947 killed between one and two million people and displaced fifteen million more.
The honest assessment is that the British Empire was a machine for concentrating power and wealth in Britain, which sometimes produced incidental benefits for colonised peoples and frequently produced deliberate harm. Removing it doesn't create a peaceful world. It creates a differently violent one, with different empires drawing different borders and inflicting different damage for the same underlying reasons.
The world without the British Empire isn't a better world or a worse one. It's a world where different European powers do roughly the same things to roughly the same people, under different flags, in different languages, with different borders that cause different wars. The question isn't really "what if the British Empire never existed?" It's "what if European imperialism never existed?" And that is a much larger thought experiment for another day.