Before slavery became a legal institution, an industry or a trade, it first required a human judgement. One person had to accept that another could be placed beneath him, stripped of freedom and treated as property. The chains were the visible result of an idea that had already been accepted in the mind.
Slavery is often discussed as though racism alone explains its existence. Racism became deeply embedded in the Atlantic slave system, but slavery itself is far older than modern racial categories. Human beings have enslaved neighbours, conquered peoples, debtors and captives who looked much like themselves. Societies have also developed prejudices around class, village, caste, religion, language, wealth, education and family status. Race is one of the most destructive categories humans have used to rank one another, but it is not the only one and it was not the first.
The same tendency can be seen in much smaller social settings. In Samoa, people can form assumptions about other Samoans based on village, district, family, education, occupation, wealth or the environment in which somebody grew up. Someone from an area regarded as rough may be judged before they have spoken. A person from a prominent family may be granted respectability before they have earned it. This is not necessarily racism, yet the underlying habit is familiar. The individual is encountered through a category that has already been assigned meaning.
The New Testament contains a simple example. When Nathanael was told about Jesus of Nazareth, he responded in John 1:46, “Can anything good come out of Nazareth?” The judgement was not racial. It was attached to place and reputation. Nazareth had become enough of a social category for Nathanael to form an opinion about someone he had not yet met.
Modern psychology has long examined the power of these group effects. Research into conformity, groupthink, social identity and deindividuation shows how people can alter their judgement and behaviour in response to the expectations of others. None of this means that collective life is inherently irrational. Human society depends on cooperation, shared knowledge and trust. Families, churches, villages, scientific communities and nations could not function otherwise. The problem arises when belonging begins to substitute for judgement.
An idea that is repeated by enough people can begin to feel self-evident even when few of those repeating it have examined its origin. Behaviour that might trouble an individual conscience can become easier to justify when responsibility appears to be shared by a crowd. The same social forces can be used for good. Communities organise after disasters, neighbours help vulnerable families and people imitate acts of courage or generosity. They can also be used to spread fear, hostility and scapegoating.
That is why propaganda has been so effective across very different societies. It does not need to create every human impulse from nothing. It can take loyalty, fear, insecurity, pride, resentment, the need to belong and the desire for status, then direct those impulses towards a chosen group. Repetition by trusted institutions can make an argument appear to be common knowledge.
Media can take part in this process, although it is important not to confuse reporting prejudice with promoting it. Journalism can expose discrimination as readily as it can amplify division. The danger lies in any institution, whether political, religious, commercial or media, repeatedly presenting groups through simplified narratives of fear, inferiority or blame until the category begins to replace the person.
Nor does rejecting the mainstream automatically amount to independent thought. Opposition movements can develop their own slogans, orthodoxies and pressures to conform. A person who simply adopts the beliefs of a smaller group has not necessarily escaped the herd. Independent judgement requires a willingness to ask why a belief is held, what evidence supports it and whether the same reasoning would still seem acceptable if it were applied to one’s own family or community.
This is important when considering slavery because the institution appears in many societies that had no concept of race resembling the one later developed in the Atlantic world. Ancient Roman slavery drew captives and slaves from many regions. War, piracy, trade, debt and birth could all lead to enslavement. Enslaved people worked in households, agriculture, mining and other parts of the economy. The distinction was fundamentally one of status and power, not simply skin colour.
New Zealand history offers another example. Māori society before European colonisation included forms of captivity and servitude involving taurekareka or mōkai. Captives could be taken in warfare and could occupy a subordinate position within another group. During the Musket Wars, access to firearms altered military power between iwi and contributed to large-scale conflict and captivity. These relationships did not depend on a theory that Māori were racially inferior to other Māori. The hierarchy was created by conquest, status and power.
Such examples make it difficult to describe racism as the original cause of slavery as a human phenomenon. Slavery could arise from military defeat, debt, punishment, economic demand or the belief that the victorious possessed rights over the defeated. What changed in the Atlantic world was the scale of the system and the extent to which African ancestry became tied to permanent and hereditary slave status.
More than 12 million Africans were forcibly transported across the Atlantic, according to the SlaveVoyages historical database. European colonial economies created vast demand for labour, particularly on plantations in the Americas, and slavery became a major commercial enterprise. Human beings were treated as assets within a system involving merchants, shipowners, plantation owners, financiers and governments. Colonial laws increasingly defined who could be enslaved, what rights owners possessed and how enslaved status would pass to descendants.
The system also involved African rulers, merchants and political networks who captured or sold people under local systems shaped by warfare, punishment and commerce. European traders often purchased captives through those networks, while European and American demand gave the Atlantic trade its extraordinary scale and profitability. Recognising African participation does not remove responsibility from European colonial powers, nor should the brutality of European slavery require pretending that every African stood outside the trade. The history is more useful when the human choices are examined without protecting any group from uncomfortable facts.
Profit is central to understanding what happened next. Once plantation economies and commercial interests became heavily dependent on enslaved African labour, the institution required more than force. It also required explanation. Societies benefiting from slavery developed legal, political, intellectual and religious arguments that made exploitation easier to defend. Africans could be described as naturally inferior, uncivilised or fitted for servitude. Racial theories gave an economic system a moral and intellectual covering.
Religious interpretation was sometimes drawn into the same task. The so-called Curse of Ham became one of the best-known biblical arguments used to defend African slavery, although Genesis does not say that Black Africans were cursed with slavery. In Genesis 9, Noah’s curse is directed at Canaan, the son of Ham. The passage says nothing about Black skin being the curse. Racial meanings were attached to the story later and were used to support an institution that already served powerful economic interests.
An established system can gradually acquire a moral story around itself. Once that story is repeated through law, education, religion, politics and everyday custom, later generations may inherit the explanation without knowing when it was created or whose interests it originally served.
State recognition gave slavery an additional layer of legitimacy without making it just. Profitability did the same, as did acceptance by respected institutions. Responsibility could then be spread across an enormous system. The merchant could say he was conducting business, the shipowner that he was providing transport, the plantation owner that the law recognised his property, the politician that the economy depended on it and the consumer that he merely bought the finished product. No single participant needed to feel personally responsible for the whole institution, yet the institution could not have survived without the participation of many.
Slavery became far more than an attitude. It was embedded in infrastructure, law, commerce, political power, inherited wealth and social status. Racial ideology helped defend those interests, while the interests themselves gave society reasons to preserve and repeat racial ideology.
Britain abolished its transatlantic slave trade in 1807 and passed the Slavery Abolition Act in 1833, with emancipation beginning in 1834 across much of the British Empire. Slave owners were compensated by the British state; the enslaved were not. By the time the Treaty of Waitangi was signed in 1840, Britain had therefore already abolished the slave trade and legislated emancipation across much of its empire.
British colonisation in New Zealand therefore unfolded in a different legal and imperial setting from the Atlantic plantation system. Māori did not become a hereditary racial slave population, but other forms of domination followed. Land, sovereignty, settlement and political control became central to the colonial relationship, followed by warfare, confiscation and long-term dispossession. The objective was different, and so was the mechanism.
Technology and military power also shaped these encounters. A society with stronger weapons, larger ships, greater capital, better navigation or more effective administrative systems possesses real advantages. History repeatedly shows the danger of converting those advantages into claims about human worth. A technological difference can easily be turned into a civilisational ranking, and a civilisational ranking into a belief that one group has a natural right to rule another.
The nineteenth-century Pacific labour trade also resists any single racial explanation. Islanders were transported to plantations and other industries in Queensland, Fiji, Samoa, New Caledonia and elsewhere. Some entered labour arrangements voluntarily, while others were deceived, coerced or kidnapped in practices that became known as blackbirding. In colonial Samoa, imported labour also became part of the plantation economy, particularly where Samoans who retained access to customary land had less reason to enter permanent plantation work.
Economic demand, political authority, land ownership, military power and group identity could all operate together. Race mattered greatly in many colonial systems, but the machinery underneath was broader than race. Human societies identify groups, attach characteristics to them, place them in hierarchies and then find reasons why unequal treatment is justified. Where economic or political benefit is involved, those justifications can become institutionalised and passed from one generation to the next.
Racism remains a real and serious phenomenon, but it sits within a broader human capacity to rank the worth of other people. The same capacity can attach itself to tribe, caste, nationality, class, education, wealth, religion, political identity or place of origin. The category changes according to the society and the interests involved.
Christian theology describes part of this problem through the idea of the natural man. Pride, domination, envy, fear, selfishness and the desire to elevate oneself above another person are not properties of one race. They are human weaknesses. Social psychology uses different language, but it observes many of the same tendencies in group behaviour, status competition and conformity.
The history of slavery becomes harder to keep at a safe distance once the focus widens beyond race alone. If it is told only as a story about one race doing something terrible to another, people outside those categories can treat it as someone else’s moral failure. But when power, profit, conformity and hierarchy are also examined, the warning becomes universal.
The question is not only how people in the past could have accepted slavery, but whether ordinary people in any society can accept serious injustice when the law permits it, respected institutions defend it, economic interests benefit from it and the surrounding group treats it as normal.
History suggests that they are.
The deepest lesson of slavery may lie beyond the chains themselves. The institution depended on the willingness of human beings to believe that another person’s freedom, dignity or life could be assigned a lower value. Laws and markets gave that belief power. Racial ideology helped give it permanence. Group conformity helped make it ordinary.
The first step, however, took place much earlier. It occurred when one human being accepted the idea that another human being belonged beneath them.
