How historians use emigrant letters as evidence

How historians use emigrant letters comes down to cross-checking, not trust. A letter tells you what the writer wanted a parent, a sibling, or a parish to believe about life in Boston or New York. Historians such as Kerby Miller and David Fitzpatrick built their major collections by reading letters alongside shipping lists, land valuations, and parish registers, then asking who kept the page, and why it survived at all.

How historians use emigrant letters as evidence

Before the 1970s, Irish emigrant letters mostly sat in family drawers, county museums, or the occasional local history pamphlet. They were treated as sentimental keepsakes rather than data, quoted for colour in a chapter rather than tested as a source in their own right. That changed as social historians began building large, cross-referenced letter collections and reading them the way a court reads correspondence: for tone, omission, and audience, not just content.

The shift mattered because letters offered something official records could not. A shipping manifest records a name, an age, and a port. A land valuation records an acreage and a rent. Neither tells you what a departure felt like to the person living it, or how a family weighed a decision that would separate them for years, possibly permanently. Letters carry that texture, provided a historian reads them with the same scepticism applied to any other source written by someone with a reason to shape the story.

Kerby Miller’s Emigrants and Exiles: Ireland and the Irish Exodus to North America, published by Oxford University Press in 1985, is the clearest example. Miller spent decades locating, transcribing, and cataloguing personal letters, diaries, and memoirs from Irish emigrants in North America, then used them to argue that many nineteenth-century Irish Catholics understood their own departure as exile rather than opportunity, whatever the economic reality behind it. The book was a finalist for the 1986 Pulitzer Prize in History and won that year’s Merle Curti Award from the Organization of American Historians, recognition that helped establish emigrant correspondence as a legitimate primary source rather than folklore.

Reading a letter as evidence, not a confession

A letter written home in 1852 was rarely a private diary entry. It was often composed with the knowledge that it would be read aloud at a fireside, passed between neighbours, or shown to a landlord’s agent as proof of a tenant’s prospects abroad. That audience shaped what got written.

David Fitzpatrick’s Oceans of Consolation: Personal Accounts of Irish Migration to Australia, published by Cornell University Press in 1994, works through this problem directly. The book gathers 111 surviving letters exchanged between 1843 and 1906 among 14 Irish emigrant families in Australia, and pairs the letters with genealogical and biographical profiles of each family so a reader can judge a claim in a letter against the facts around it. Fitzpatrick organises his analysis across six themed chapters rather than family by family, which lets a reader compare how different households described the same kind of experience, a wage, a passage, a piece of land, side by side rather than in isolation.

Fitzpatrick’s method treats a letter as one half of a conversation, not a finished statement. A son’s cheerful account of steady wages might be answering a mother’s earlier worry about a lost harvest, and the letter only makes full sense once you know what she had asked. The book’s title comes from a phrase used by one young Irish emigrant in rural Australia, who called a letter from his father in County Clare, received in 1855, “an ocean of consolation”: a reminder that for the family reading it, the letter’s emotional weight often mattered as much as its factual content.

That is also why historians weigh a single dramatic sentence in a letter against the pattern across dozens of others from the same family or district. One emigrant’s claim to have prospered inside two years proves little on its own. The same claim repeated, with variation, across a cluster of letters from the same townland carries more weight, because it starts to describe a shared experience rather than one person’s performance for a nervous parent.

What survives, and why: the archive’s survivorship problem

The letters historians can read today are not a random sample of what was written. They are the ones a family chose to keep, that were not lost in a house fire or a house clearance, and that eventually reached an archive, a local historian, or a university appeal.

This gap starts before a single word was even written. The 1841 census, the first in Ireland to record literacy directly, found that only 28 per cent of the population over the age of five could both read and write, a further 19 per cent could read but not write, and 53 per cent could do neither. Letters written or dictated by that literate minority survive in far greater numbers than any account of the majority who could not put a request in their own hand, which is one reason so many surviving letters were dictated to a scribe rather than written by the emigrant themselves.

Collection history compounds the bias. The University of Galway’s Imirce archive, built from Kerby Miller’s personal research collection and launched in March 2024, now holds more than 7,000 complete letters drawn from over 150,000 digitised pages, covering correspondence from Irish emigrants in North America between 1675 and 1950. It is one of the largest holdings of its kind, and it exists because Miller spent five decades tracking down descendants willing to hand over family papers. In March 2025, the Carnegie Corporation of New York awarded the project $300,000 to expand the digital archive, build teaching resources, and improve how the collection can be searched and visualised, which means the archive itself is still growing rather than fixed.

A family that emigrated, prospered, and stayed in contact for generations was far more likely to have letters worth donating than a family that lost touch after one difficult year, or whose letters simply did not survive being read to pieces at a fireside. Anyone working through a real archive of Irish emigrant letters is, in that sense, reading the record of the families who kept writing, not the full range of those who emigrated.

Two historians, one hoard, two arguments

The same body of letters can support different conclusions, which is part of why Miller’s and Fitzpatrick’s work is read together rather than as a single settled account. Miller argued that the language of exile in Irish emigrant letters reflected a deeply held Irish Catholic identity, one shaped by dispossession and famine, that made emigrants describe departure as expulsion even when the immediate cause was a shrinking family farm.

The historian Donald Harman Akenson pushed back, arguing that reading Irish emigration primarily through American letters and an exile framework understated emigrants’ own agency and gave a skewed picture of the wider Irish diaspora. He pointed to Irish settlement in Canada, Australia, New Zealand, and South Africa, where Catholic emigrants often became landowning farmers and reached occupational outcomes close to the native-born population within a generation, a pattern harder to square with a story built solely around loss and exile. Akenson’s argument is itself a lesson in source selection: choose your letters from Boston and New York alone, and an exile narrative looks dominant; broaden the comparison to Irish settlement across the wider English-speaking world, and a different, more varied picture appears.

Neither historian disputes what the letters say. They disagree about what weight to put on which letters, and which countries’ emigrant correspondence should anchor the wider argument. That disagreement is itself useful for a reader: it shows that the same primary source can carry more than one honest interpretation, depending on which comparisons a historian brings to it, and it is a fair warning against treating any single collection, however large, as the whole story of Irish emigration.

What historians cannot know

Some limits in the record cannot be closed, no matter how large an archive grows. Historians cannot know how many letters were written and never survived, so any count of surviving letters describes what remains, not what was sent. A reply that answers a lost original letter can be read only in half.

They also cannot fully separate a scribe’s phrasing from an emigrant’s own words when a letter was dictated, which was common among people who could speak fluently but not write. A letter’s stated reason for emigrating cannot always be checked against the writer’s private reasoning, since a letter home to a father who controlled family land was not the place to admit doubt or regret. And because women’s letters survive in smaller numbers than men’s relative to how many women actually emigrated, any pattern drawn from the surviving archive risks overweighting male voices unless a historian corrects for it deliberately.

A historian also cannot know, in most cases, how a letter’s news was received. The written record shows what was sent; it rarely shows the conversation that followed at a fireside, or whether a promise made in ink was believed by the people who read it. Archives such as Imirce make it possible to search thousands of letters at once, but a search result is still only ever a list of what was written down, not a transcript of what a family actually understood or felt.

None of this makes emigrant letters unreliable as evidence. It means each letter has to be read for what kind of evidence it actually is: a statement made to a particular person, for a particular reason, that survived by chance as much as by design.

Reading letters alongside the rest of the record

In practice, a historian rarely relies on a letter alone. A claim about wages is checked against wage rates reported elsewhere for the same trade and city. A claim about a safe crossing is checked against what is known of shipping conditions in that year. A family’s account of hardship at home is set beside the wider run of reports on harvests, rents, and evictions in that district and season. The letter supplies the voice; the surrounding record supplies the check.

This is also why growing digital collections change the work rather than finishing it. A single letter read in isolation can only be interpreted so far. The same letter read alongside 100 others from the same county, decade, and social class starts to show which details were typical and which were unusual, which is the difference between a historian using one letter as an anecdote and using a body of letters as evidence. As more family collections are catalogued and made searchable, that comparison only gets more precise, which is likely to keep revising, rather than settling, how historians read the Irish emigrant experience.

Sources and further reading

• Kerby A. Miller, Emigrants and Exiles: Ireland and the Irish Exodus to North America (Oxford University Press, 1985).
• David Fitzpatrick, Oceans of Consolation: Personal Accounts of Irish Migration to Australia (Cornell University Press, 1994).
• Imirce: the Kerby Miller Collection of Irish Emigrant Letters, Moore Institute, University of Galway, launched March 2024.
• 1841 Census of Ireland, literacy returns, as summarised by History Ireland.
• Donald Harman Akenson’s critique of Miller’s exile thesis, as discussed in subsequent scholarly reviews of Irish diaspora historiography.
• RTÉ News, “Online archive showcases 400 years of Irish emigrant letters,” 8 March 2024.