Evaluating Primary Sources on Slavery

Key takeaways

• Most surviving documents were created by people who took part in or profited from the system, so every source has a perspective, a purpose and silences.
• Use the same five questions each time: who created it, what is it, why was it made, how reliable is it, and what is missing.
• Read traders' records against the grain, looking for traces of resistance and humanity, without reading in more than the evidence allows.
• Testimony by the enslaved, such as Olaudah Equiano's account of 1789, is vital evidence but must be read in light of its audience and editors.
• Introduce disturbing sources with context and advance notice, and pair them with sources showing resistance and culture.

Why does source work matter so much?

Primary sources let students encounter the past directly, but the sources for the Atlantic slave trade pose particular challenges. Most surviving documents were created by people who participated in or profited from the system: merchants, ship captains, colonial officials, planters and insurers. The people who experienced enslavement had far less opportunity to leave written records, and when they did, those records were shaped by who published them and why. A teacher who prepares students to read these sources critically gives them a lasting skill and a more accurate picture of the past.

This guide proposes a method that can be used with documents of many types, and it notes the typical strengths and limits of the main categories of evidence.

A simple framework: who, what, why, how, what is missing

Ask students to work through the same questions with every source.

• Who created it? Identify the author, their role and their interests. Was this person enslaved, an enslaver, an official, a campaigner or a visitor?
• What is it? Name the type of source, its date and its place of origin. Is it a private letter, a legal document, a printed pamphlet or an account book?
• Why was it made? Consider the purpose and the intended audience. Was it written to persuade, to record, to sell, to defend or to comply with a law?
• How reliable is it? Compare it with other evidence. Consider whether the author witnessed events or was reporting at second hand.
• What is missing? Ask whose voice is absent and what the source cannot tell us.

Source types at a glance

Source type	Strength	Limitation
Ship logs, manifests, customs and insurance records	Systematic detail on routes, ports and goods; underpin quantitative work	Treat people as cargo or property and rarely record names
Laws and slave codes	Show how the system defined and controlled people	Written from the perspective of those with power
Advertisements and plantation records	Descriptions of skills and languages; sometimes allow families to be traced	Documents of dehumanisation; introduce with care
Narratives and testimony by the enslaved	First-hand accounts of the experience	Shaped by audience, editors and sponsors
Images and artefacts	Powerful and varied	Constructions made with a purpose and an audience

What can traders' and officials' records tell us?

Ship logs, crew lists, cargo manifests, customs records, company correspondence and insurance documents provide detail about routes, ports, goods and the operation of voyages. Their strength is that they were often kept systematically, which is why they underpin so much of the quantitative work on the trade. Their limitation is perspective. They describe enslaved people as cargo or as property, rarely recording names, languages or personal stories, and the writers had reasons to present events in the way most favourable to themselves. A captain describing a death at sea, for example, may have been concerned with accounting for lost value or defending his conduct.

When students use these records, invite them to read against the grain: to look for the humanity and agency that the document tries to suppress, such as references to revolts, refusals, illnesses or attempts at escape. Remind them that doing so requires care to avoid reading in more than the evidence allows.

What do laws, advertisements and plantation records show?

Colonial laws, called slave codes in many places, show how the system defined and controlled people and what slaveholders feared. Newspaper advertisements for the sale of people or for the return of those who had escaped reveal valuable details, including descriptions of skills, languages and physical appearance, but they are also documents of dehumanisation and should be introduced with care. Plantation inventories, wills and account books list names and values, and sometimes allow historians to trace families. All of these are written from the perspective of the people with power, but they also contain evidence of how enslaved people lived and resisted.

How should I read testimony by the enslaved?

Autobiographies and interviews with formerly enslaved people are among the most important sources, because they come from those who lived the experience. Olaudah Equiano's account, published in 1789, is a well-known example from the eighteenth century, and many nineteenth-century narratives circulated widely. They require thoughtful reading as well. Authors often wrote for particular readers, such as abolitionist audiences, and sometimes worked with editors or sponsors who shaped the text. Historians debate details in some accounts, including questions about the authors' origins or the accuracy of particular episodes, and good teaching presents such debates openly rather than hiding them. None of this lessens the value of testimony; it simply places it among the other evidence.

Oral histories, songs, stories and material culture preserved by descendant communities offer additional perspectives. Archaeology, including the study of burial grounds and the remains of housing and tools, recovers information that written records omit.

How do I analyse images and artefacts?

Prints, paintings, maps and photographs can be powerful, but they must be analysed as constructions. An illustration of a slave market, for instance, may have been produced by an abolitionist to move public opinion or by a traveller with a particular agenda. A portrait of a wealthy merchant may leave out the people whose labour funded his wealth. Ask students about the creator, the audience and the choices of composition, and what the image deliberately includes or omits.

What are the silences in the archive?

Historians use the idea of archival silence to describe the absence of certain people's voices from the records. For the Atlantic slave trade the silences are profound. Many enslaved people left no written account, and records frequently refer to them by a price, a number or a changed name. Students can reflect on why those silences exist and how historians try to address them, whether through careful reading of surviving documents, collaboration with descendant communities, archaeology or imaginative but evidence-bound reconstruction. It is important that students understand that absence of evidence is a product of power and not a sign that nothing happened.

What works in the classroom?

• Provide short extracts with background notes, and keep distressing material to what the learning goal requires.
• Use paired sources that present contrasting viewpoints, such as a captain's account alongside an enslaved person's testimony, and ask students to explain the differences.
• Teach students to separate what a source says from what it shows. A pro-slavery pamphlet, for example, shows how its author argued, even when what it says is false.
• Ask students to write a short evaluation that states a claim, cites the evidence and acknowledges limits.
• Be transparent about uncertainty. Teach that historians reach reasoned conclusions, not certainties.

Key points to remember

Every source on this subject has a perspective, a purpose and silences. Students who learn to ask who made a document, why, and whose voice is missing will read all historical evidence more carefully. Treating testimony by the enslaved with respect, and the records of traders with healthy scepticism, helps them reconstruct a history that is both accurate and humane.

Frequently asked questions

Why are most surviving sources written by slave traders and officials?

Because those with power and literacy created and preserved most records, while enslaved people were often denied education and had fewer chances to have their words recorded. Records also survived unevenly, and archives were lost to fire, neglect and war. Students should ask why a source exists and whose voice is missing from it.

Can testimony by formerly enslaved people be trusted?

Yes, as valuable evidence, but it should be read like any source, considering audience, editors and purpose. Authors often wrote for abolitionist readers and worked with editors or sponsors. Historians compare testimony with other evidence while giving it serious weight, and good teaching presents any debates about details openly.

What does reading against the grain mean?

It means looking in documents written from the perspective of the powerful for traces of the experiences and actions of the people they describe, such as references to revolts, refusals, illnesses or attempts at escape, while staying within what the evidence supports. Ship captains' fear of uprisings, for example, is itself evidence of expected resistance.

How should I introduce disturbing sources?

Give context and advance notice, use only what the learning goal needs, and pair them with sources showing resistance, culture and the voices of the enslaved. Introduce advertisements for sales or escapes with particular care, since they are documents of dehumanisation, and offer students alternatives if they need them.