A HISTORY OF RACISM,SLAVERY & RACIAL PROGRESS

Introduction: race, slavery and power are related — but not identical

Human beings have exploited, conquered and enslaved one another for thousands of years. Yet slavery has taken many forms, and most ancient systems were not organised around the modern concept of biological race. Captivity could follow war, debt, punishment, piracy, birth or social status. People enslaved in the Roman, Mediterranean, African, Middle Eastern and Asian worlds could come from many populations.

Modern racism developed much later through a changing mixture of religion, empire, law, economics and pseudoscience. From the fifteenth century onward, European expansion into Africa, Asia and the Americas increasingly linked ancestry, skin colour and legal status. Atlantic plantation slavery then hardened these distinctions into hereditary racial hierarchies whose influence survived formal emancipation.

At a glance: a global timeline

1. Before modern race: ancient slavery and human hierarchy

Slavery existed in many early civilisations, but it varied greatly. Mesopotamian law recognised slaves, debt bondage and forms of dependency. Classical Athens depended heavily on enslaved labour despite its celebrated democratic institutions. Rome developed one of the ancient world's largest slave systems; enslaved people worked in households, mines, agriculture, administration, education, entertainment and skilled trades.

Ancient slavery could be extraordinarily violent, yet it was not normally based on a single colour line. A person might be enslaved because an army lost a war, because they were born to an enslaved mother, through raiding or trafficking, or through debt. Manumission was possible in some societies, although freed people could remain socially disadvantaged.

Large slave systems also developed beyond Europe. Networks across North Africa, the Middle East, the Indian Ocean and parts of Asia moved captives over many centuries. African societies themselves included slavery and forms of servitude before European Atlantic expansion. A global history therefore has to recognise both the universality of coercive labour and the historically distinctive character of later racialised plantation slavery.

2. How 'race' became a system

The idea that visible human differences represent fixed, natural and hierarchical races was not timeless. It was constructed gradually. Medieval European hostility often centred on religion, lineage, language and legal status. Iberian ideas of 'purity of blood', anti-Jewish and anti-Muslim discrimination, conquest and conversion helped create precedents for inherited forms of exclusion.

European overseas expansion then transformed these ideas. Conquest required moral and legal justifications. Papal bulls and doctrines later grouped under the 'Doctrine of Discovery' helped Christian European powers rationalise claims over non-Christian territories. The separate legal concept of terra nullius — land treated as belonging to no sovereign recognised by colonisers — was used in some colonial contexts. These concepts should not be treated as identical.

In the Americas, Indigenous peoples faced warfare, forced labour, enslavement, displacement and catastrophic epidemic disease after 1492. As colonial plantation economies expanded, European powers increasingly imported enslaved Africans. Over time, ancestry and skin colour became attached to inherited legal status: slavery could be passed from mother to child, freedom became associated with whiteness, and colonial law encoded racial hierarchy.

3. Atlantic slavery: people turned into property

The transatlantic slave trade was one component of a much larger history of slavery, but its scale, commercial organisation and racial heredity gave it a distinctive global impact. SlaveVoyages estimates that about 12.52 million captive Africans were embarked on Atlantic slave ships and about 10.7 million disembarked, mainly in the Americas. This means roughly 1.8 million died during the ocean crossing itself; many more died during capture, forced marches, confinement on the African coast and the violent 'seasoning' period after arrival.

The commercial system

European merchants carried manufactured goods, metals, weapons, textiles and other commodities to African trading zones. Captives were acquired through complex systems involving warfare, kidnapping, judicial enslavement, debt, African intermediaries and European commercial pressure. Ships then crossed the Atlantic on the Middle Passage. Plantation commodities — especially sugar, coffee, tobacco, cotton and later other products — flowed into European and global markets.

The familiar 'triangular trade' diagram is useful as a teaching device but can be misleading if taken literally. Actual trading routes were more complex, with ships moving among many ports in Europe, Africa, the Caribbean, North and South America. Brazil received more enslaved Africans than any other single destination, while British, Portuguese/Brazilian, French, Spanish, Dutch and other traders all participated.

Life under plantation slavery

• · Enslaved people were legally commodified: they could be sold, mortgaged, inherited and separated from partners or children.

·       Plantation regimes relied on surveillance, corporal punishment and the threat of sexual violence, while women often faced both forced labour and gendered exploitation.

·       Mortality could be extreme, particularly in sugar economies. Some colonies depended on continuous importation because deaths exceeded births.

·       Enslaved people nevertheless created families, religions, languages, music, political networks and cultures that profoundly shaped the Atlantic world.

4. Pseudoscience, racial classification and 'white supremacy'

As slavery and empire expanded, intellectual traditions were increasingly recruited to defend inequality. Enlightenment-era naturalists including Carl Linnaeus and Johann Friedrich Blumenbach classified humanity into categories. Blumenbach popularised the term 'Caucasian', which later acquired meanings far beyond his original taxonomy. By the nineteenth century, craniometry, polygenism, phrenology and Social Darwinist arguments were used to portray social hierarchies as biological facts.

These ideas were not simply 'bad science' isolated from society. They interacted with colonial administration, schools, museums, medicine, immigration law and policing. Racial stereotypes helped present conquest as civilisation and unequal treatment as natural. Modern genomics rejects these old typologies: populations have ancestry and patterns of genetic variation, but racial labels are historically changeable social categories rather than discrete biological subspecies.

5. Empire and the globalisation of racial hierarchy

Nineteenth-century imperialism extended racial governance across much of the world. European powers carved up most of Africa, ruled the Indian subcontinent, dominated large parts of Southeast Asia, expanded settler colonies and imposed unequal treaties and political control elsewhere. Imperial systems differed, but ideas of civilisation, racial capacity and cultural superiority frequently justified unequal citizenship and forced labour.

Selected examples

• · Congo Free State: under King Leopold II's personal rule, coercive rubber extraction, hostage-taking, mutilation, famine, disease and violence caused catastrophic loss of life. Exact totals remain debated, so claims of a single precise death figure should be treated cautiously.
• · British India: colonial rule transformed taxation, agriculture, trade and administration while racial distinctions structured power and access to elite positions.

·       Settler colonialism in Australia, Canada, New Zealand and the United States displaced Indigenous peoples through land seizure, warfare, treaty violations and assimilation policies.

·       Residential and boarding school systems in North America removed Indigenous children from families, suppressing language and culture and exposing many to neglect and abuse.

·       Colonial rule also generated resistance, adaptation and anti-colonial intellectual movements; colonised people were active political actors, not merely victims.

6. Eugenics: racism, disability and the state

Eugenics emerged in the late nineteenth century from the idea that states could improve populations by encouraging reproduction among people judged 'fit' and discouraging or preventing it among those judged 'unfit'. It drew together class prejudice, racism, ableism, anxieties about immigration and mistaken assumptions about heredity.

Compulsory sterilisation laws were enacted in parts of the United States and elsewhere. Immigration restrictions, marriage controls and institutionalisation were also justified in eugenic terms. Nazi racial policy took these ideas to genocidal extremes, but eugenics had already been debated and practised in democratic societies. Its history is an important warning about how scientific authority can be distorted when social categories are treated as biological destiny.

7. Abolition: moral campaigns, resistance and revolution

Abolition was not a single humanitarian gift delivered by governments. It emerged from a prolonged contest involving enslaved resistance, Black abolitionists, religious campaigns, free Black communities, political organisers, writers, economic change, revolutions and war.

The Haitian Revolution, 1791–1804

The uprising in the French colony of Saint-Domingue became the most consequential successful slave revolution in Atlantic history. Enslaved and free people of colour defeated colonial forces and, after conflict involving Spain, Britain and Napoleonic France, created independent Haiti in 1804. Haiti abolished slavery and shattered claims that plantation slavery was unchallengeable. The new state was subsequently isolated and forced by France in 1825 to accept a huge indemnity in exchange for recognition, burdening Haiti for generations.

Britain: abolition and its contradictions

Britain abolished its participation in the transatlantic slave trade in 1807, but slavery itself continued in much of the empire until the Slavery Abolition Act 1833 came into force in 1834. More than 800,000 enslaved people were legally emancipated, although many were initially compelled into an 'apprenticeship' labour system before full freedom in 1838.

The British state paid £20 million compensation to slave owners for the loss of what law had treated as their property; formerly enslaved people received no compensation. The Bank of England administered payments, and UCL's Legacies of British Slavery research has documented tens of thousands of claimants and traced how slave-derived wealth permeated British business, politics, property and culture.

The abolition story also remained unfinished. Illegal trafficking continued after 1807, and coerced labour persisted in many imperial settings. A newly reported 1847 letter, publicised in August 2026, is among the archival reminders that British commercial involvement in trafficking and exploitative systems did not simply stop on the date Parliament changed the law.

8. After slavery: freedom without equality

Formal emancipation removed legal ownership of human beings but did not automatically redistribute land, wealth or political power. Across post-slavery societies, new systems often preserved racial hierarchy.

·       Sharecropping and debt peonage tied many freed families to landowners through chronic indebtedness.

·       US convict leasing exploited the Thirteenth Amendment's exception permitting involuntary servitude as punishment for crime.

·       Vagrancy laws and discriminatory policing criminalised forms of Black mobility and unemployment.

·       Colonial forced-labour systems continued in Africa and elsewhere under European rule.

·       Racial wealth gaps accumulated across generations through unequal access to land, credit, education, employment and housing.

9. Jim Crow, racial terror and apartheid

The United States

After the US Civil War, Reconstruction briefly expanded Black citizenship and political participation. It was met by organised white-supremacist violence and later by segregationist law. Jim Crow systems restricted voting, schooling, transport, housing and public life. Racial terror was central to enforcement: the Equal Justice Initiative has documented nearly 6,500 racial terror lynchings of Black people between 1865 and 1950, including more than 4,400 from 1877 to 1950.

This violence was not only about individual murders. Public lynching, intimidation and impunity were designed to control communities, suppress voting, enforce labour relations and punish Black social or economic advancement. Segregation was therefore maintained through both law and terror.

South Africa

South African racial domination pre-dated 1948, but the National Party then codified apartheid into a comprehensive system. Population classification determined residence, education, movement, marriage, employment and political rights. Black South Africans were denied meaningful national citizenship and forcibly removed on a vast scale. Resistance included the African National Congress, Pan Africanist Congress, trade unions, civic organisations and global anti-apartheid campaigns. Formal apartheid ended through negotiation, followed by the first democratic election with universal adult suffrage in 1994.

Other exclusionary systems

·       Australia's 'White Australia' immigration framework restricted non-European immigration for much of the twentieth century and was dismantled progressively after the Second World War.

·       Canada and the United States operated coercive Indigenous residential or boarding schools; Australia's assimilation policies included the removal of Aboriginal and Torres Strait Islander children now associated with the 'Stolen Generations'.

·       Antisemitism, anti-Roma persecution and colonial racialisation in Europe culminated in or interacted with some of the twentieth century's most violent projects of exclusion.

10. Civil rights, anti-colonialism and decolonisation

The middle decades of the twentieth century transformed the legal landscape. The Second World War, anti-fascism, mass mobilisation in colonies, changing global power and the language of universal human rights all weakened the legitimacy of formal racial empire.

United States civil rights

Black organisers, churches, students, lawyers, trade unionists and community groups challenged segregation through litigation, boycotts, direct action, voter registration and mass protest. The Civil Rights Act 1964 prohibited major forms of discrimination, while the Voting Rights Act 1965 attacked barriers to Black voting. Martin Luther King Jr. became internationally associated with non-violent protest; Malcolm X, Stokely Carmichael/Kwame Ture, the Black Panther Party and others stressed self-determination, anti-imperialism, community protection and structural change.

Decolonisation

India and Pakistan became independent in 1947, Ghana in 1957, Nigeria in 1960, Kenya in 1963 and Mozambique in 1975, among many others. Decolonisation was sometimes negotiated and sometimes achieved through prolonged warfare. The new states inherited borders, economies and institutions profoundly shaped by empire, and the Cold War frequently complicated their development.

Decolonisation was also intellectual and cultural. Négritude, Pan-Africanism, Caribbean thought, Indigenous revival movements, anti-caste activism and post-colonial scholarship challenged assumptions about whose history, knowledge and culture counted as universal.

11. Britain: race, empire, migration and multicultural society

Britain's modern racial history cannot be understood only through events overseas. Empire shaped wealth, ports, finance, consumer culture, citizenship and migration. After the Second World War, migration from the Caribbean, South Asia, Africa and elsewhere helped rebuild the country and transformed British culture.

The arrival of HMT Empire Windrush in 1948 became a symbol of post-war Caribbean migration, although Black people had lived in Britain for centuries. Migrants encountered colour bars in employment and housing, racist violence and political hostility. The Race Relations Acts of 1965, 1968 and 1976 progressively expanded legal protections, followed by later equality legislation.

The 1999 Macpherson Report into the murder of Stephen Lawrence made 'institutional racism' a central term in British public debate, defining how organisational processes and failures can generate unequal outcomes even without explicit racist intent by every individual involved. Twenty-first-century debates have continued around policing, migration, educational outcomes, health inequalities and the treatment of the Windrush generation.

12. Racism in the twenty-first century: overt prejudice and structural inequality

Explicitly racist law has been dismantled in many countries, but racism can persist through institutions, inherited disadvantage, stereotypes and unequal exposure to risk. Structural racism does not mean that every disparity has one cause or that every individual within a group has the same experience. It describes the way policies, practices and accumulated historical conditions can produce patterned differences across populations.

Health

One contemporary example is maternal health. In the latest UK MBRRACE-UK data covering 2021–2023, the maternal mortality rate for women from Black ethnic backgrounds in England remained more than twice that for White women (rate ratio 2.27). The gap has narrowed compared with some earlier reports, but it remains a major inequality requiring investigation and action. Race itself is not a biological cause; relevant pathways can include differences in disease burden, deprivation, access, communication, treatment, discrimination and the quality of care.

Criminal justice and policing

Disproportionate stops, arrests, use of force, incarceration and sentencing remain subjects of extensive research and public debate in several countries. Interpretation requires careful attention to local law, age, deprivation, neighbourhood exposure, offence patterns, institutional practices and discrimination rather than reducing complex outcomes to a single variable.

Housing, wealth and education

Historical exclusion from property ownership, mortgages, skilled employment and high-quality schooling can persist through intergenerational wealth. In the United States, redlining and discriminatory housing policy are well-documented examples. In Britain and Europe, research continues to examine ethnic differences in housing, employment, school exclusion and labour-market outcomes.

Algorithms and artificial intelligence

Digital systems can reproduce inequalities when training data, measurement choices or deployment settings reflect biased historical patterns. Facial-recognition systems have shown demographic differences in error rates in benchmark testing, and automated decision systems may indirectly use proxies for race. The important lesson is not that algorithms are inherently racist, but that technical systems inherit assumptions from data, design and institutions and therefore require auditing, transparency and human oversight.

13. Global racism is not one single pattern

A genuinely global account needs to avoid treating racism as only a Black–White issue. Different societies construct hierarchy around ethnicity, caste, religion, nationality, indigeneity, language, migration status and colour. These systems overlap but are not interchangeable.

·       Anti-Black racism has deep legacies in the Americas, Europe, the Middle East and other regions.

·       Antisemitism has repeatedly combined religious hatred with racial conspiracy theories and culminated in the Holocaust.

·       Roma communities have faced centuries of exclusion, enslavement in parts of Europe, persecution and genocide.

·       Indigenous peoples across the Americas, Australasia and elsewhere have faced settler dispossession, forced assimilation and attacks on sovereignty.

·       Caste discrimination, while not identical to race, can operate through inherited social hierarchy and exclusion and can intersect with colour and ethnicity.

·       Anti-Muslim, anti-Asian and anti-migrant prejudices have taken distinct forms in different historical settings.

14. Racial justice, memory and progress since 2000

The twenty-first century has seen both significant progress and renewed conflict over race. Representation has widened in politics, universities, media, business and culture in many countries. Legal protections have strengthened, and overt claims of biological racial superiority are far less acceptable in mainstream institutions than a century ago.

At the same time, highly visible deaths, unequal outcomes and resurgent nationalist politics have fuelled large protest movements. Black Lives Matter, founded in 2013, expanded dramatically after the murder of George Floyd in Minneapolis on 25 May 2020. The movement accelerated global debates about policing, public monuments, institutional history and the meaning of systemic racism.

Campaigns such as Rhodes Must Fall and wider 'decolonising the curriculum' movements ask institutions to reconsider whose histories and intellectual traditions are centred. Critics and supporters sometimes disagree about methods, terminology or the treatment of historical figures, but the broader debate reflects a major change: institutions are increasingly expected to examine how their wealth, collections, curricula and prestige were shaped by empire and slavery.

15. Reparations, restitution and restorative justice

Reparations debates ask what societies owe after slavery, colonial expropriation, segregation and state violence. Proposals vary widely and include direct payments, community investment, debt relief, educational programmes, land restitution, memorialisation, formal apologies, institutional funds and the return of cultural objects.

There is no single global model. Some argue that the passage of time, complex ancestry and difficulty assigning liability make financial reparations impractical or unjust. Others argue that states and institutions can trace specific benefits and harms, and that present-day inequality cannot be separated from historical extraction. Whatever position is taken, serious discussion benefits from distinguishing symbolic acknowledgement, restitution of identifiable property, compensation for documented harms and broader social investment.

16. Progress is real — and incomplete

History does not support a simple story in which racism steadily disappears. It shows periods of reform followed by backlash, and moments when old hierarchies are rebuilt in new forms. Yet it is equally inaccurate to claim that nothing has changed.

Chattel slavery is outlawed almost everywhere. Colonial empires have largely dissolved. Formal apartheid and Jim Crow have ended. Universal human rights norms, anti-discrimination laws and democratic participation have expanded. Interracial families and multicultural societies are commonplace in places where they were once criminalised or taboo. Millions of people now have legal and political rights denied to their grandparents or great-grandparents.

The remaining challenge is often less visible than the older legal colour line. It involves inherited wealth, institutions, unequal exposure to disadvantage, cultural stereotypes and disagreements about how much disparity reflects discrimination versus other social factors. Good anti-racist work therefore requires evidence, historical literacy and a willingness to test claims rather than relying on slogans.

17. How to discuss this history responsibly

·       Distinguish slavery from racism. Slavery existed before modern race, but Atlantic plantation slavery became intensely racialised.

·       Avoid implying that only Europeans practised slavery; also avoid using non-European slavery to minimise the distinctive scale and legacy of European Atlantic colonialism.

·       Separate ancestry from race. Genetic ancestry can be measured; racial categories are socially defined and historically variable.

·       Use precise dates and numbers, and acknowledge uncertainty where historians disagree.

• · Centre agency as well as suffering: revolt, escape, political organisation, culture and intellectual resistance are part of the story.

·       Do not treat any racial or ethnic population as internally uniform.

·       Recognise progress without using it to dismiss continuing inequality.

• · Avoid presentism: historical actions should be understood in context, while context does not require moral neutrality about slavery, torture or genocide.

Conclusion: reclaiming a shared humanity

• The history of racism is a history of power: of people being classified, exploited and excluded, and of institutions finding ways to make hierarchy appear natural. Slavery and empire helped give modern racial categories enormous economic and political force. Pseudoscience then attempted to convert those categories into biology.

But the same history is also filled with resistance. Enslaved people escaped and revolted. Abolitionists organised across borders. Colonised peoples built independence movements. Civil-rights activists changed law through extraordinary personal risk. Writers, musicians, artists, scholars and communities refused the identities imposed on them and created new forms of belonging.

Progress has never been automatic and has never moved in a straight line. It has depended on evidence, organisation, law, culture, moral argument and collective action. Understanding that history in full — including its contradictions — is one way to avoid repeating it.

Key facts: corrected and updated

Selected references and further reading

1. National Human Genome Research Institute (NHGRI). Race. Talking Glossary of Genetic Terms. Updated 21 August 2026. genome.gov ↗
2. National Academies / NHGRI. Using Population Descriptors in Genetics and Genomics Research: A New Framework for an Evolving Field. 2023.
3. SlaveVoyages. The Trans-Atlantic Slave Trade Database: methodology and estimates. slavevoyages.org ↗
4. UNESCO. The deep legacy of slavery. Updated 28 March 2025. unesco.org ↗
5. Bank of England. The collection of slavery compensation, 1835–43. Staff Working Paper No. 1006, 2022.
6. Bank of England Museum. Marking the Bank of England's links to transatlantic slavery. 4 November 2024.
7. UCL Centre for the Study of the Legacies of British Slavery. Legacies of British Slave-Ownership database and research programme.
8. Equal Justice Initiative. Reconstruction in America; Lynching in America: Confronting the Legacy of Racial Terror. Updated research documenting nearly 6,500 racial terror lynchings, 1865–1950.
9. MBRRACE-UK / National Perinatal Epidemiology Unit, University of Oxford. Maternal mortality 2021–2023. 2025 report, updated January 2026.
10. United Nations. Universal Declaration of Human Rights, 1948.
11. Smithsonian Institution resources on the Haitian Revolution and African diaspora history.
12. Bank of England Museum. Slavery & the Bank online exhibition and research resources.
13. Neurohaven. Society and human-history educational resources. neurohaven.co.uk