Tens of thousands of Canadians lived in Buffalo, New York, at the start of the twentieth century.
In 1900, 17,242 people living in Buffalo reported that they had been born in Canada, according to tables from the United States Census Office. This meant that about one in every 20 Buffalo residents had been born in Canada.
Canadians were the city’s third-largest immigrant group at the time. More Buffalo residents had been born in Canada than in Ireland, while nearly twice as many had been born in Canada as in England, Scotland and Wales combined.
A Canadian citizenship law that took effect in December 2025 has given this historical connection new importance. People who can trace their family line to a Canadian-born ancestor may now be able to claim Canadian citizenship, even if their families have not maintained a strong connection to Canada.
Why Buffalo’s Canadian Population May Have Been Larger?
Historical records suggest that the number of Buffalo residents with Canadian roots may have been higher than census figures show.
Randy William Widdis, a historical geographer at the University of Regina, has studied English Canadians who moved to the United States. His research has examined why historians often overlooked this immigrant population.
One reason was that English Canadians generally spoke the same language as people in the United States. Because they could blend into American communities more easily, researchers often paid less attention to them.
The way the United States census collected ancestry information may also have affected the numbers.
The census form provided examples to help people identify their ancestry. ‘French Canadian’ appeared among those examples, while ‘Canadian’ did not. This could have encouraged people to identify with other backgrounds instead of reporting Canadian ancestry.
The census also recorded only the first two ancestries reported by each person.
Many Canadians who moved to Buffalo came from Ontario and had English, Scottish, Irish or German family backgrounds. Their descendants may therefore identify with those older origins rather than describing themselves as Canadian.
Three Signs A Buffalo Family May Have A Claim
Family records can provide clues that a Buffalo family has a Canadian connection.
French Canadian families may have surnames such as Tremblay, Gagnon or Pelletier, which can point toward Quebec. However, Ontario families often have English, Scottish or Irish surnames. A family with a surname such as Kelly, for example, could have roots in Ontario or Ireland.
Other historical records can help establish the connection.
- A Canadian birthplace in an old census record. United States censuses from 1880 to 1930 recorded the birthplace of each person and their parents. Finding ‘Canada’ beside an ancestor or one of their parents can provide an important clue.
- A naturalization record. United States naturalization documents from 1906 onward recorded an applicant’s place of birth. These records can help confirm where an ancestor came from.
- Family connections across the Niagara River. Relatives in places such as Hamilton, St. Catharines or Toronto, or a family story about moving to Buffalo from Canada, may help identify an Ontario connection.
A single clue does not establish citizenship. The applicant must document a direct family line leading to an ancestor who was born in Canada or became a Canadian citizen.
Genealogy websites, historical databases and other research tools can help applicants locate the records needed to establish that connection.
A Law That Removed The Generational Limit
Bill C-3 came into force on December 15, 2025, and changed Canada’s citizenship-by-descent rules.
Before the change, Canadian citizenship by descent was generally limited to the first generation born outside Canada. Citizenship by descent refers to citizenship inherited through a parent or another qualifying ancestor rather than through birth in Canada.
The new rules removed this generational limit for people born before December 15, 2025. The changes also applied to citizenship claims involving earlier generations.
As a result, a person with one documented Canadian ancestor in their direct line of descent may be able to hold Canadian citizenship.
The person must still apply to the Canadian government and provide documents proving the connection between each generation.
A proof of citizenship application is used to establish Canadian citizenship. Applicants do not need to pass a language test or meet a residency requirement to make this type of citizenship claim. They also do not need to take an oath to obtain proof of citizenship.
Canada and the United States both allow dual citizenship, so a person who qualifies may be able to hold citizenship in both countries.
How Applicants Can Prove Their Family Line?
A citizenship application generally requires applicants to trace their family history one generation at a time.
Documents such as birth certificates, marriage records, baptismal records and death certificates can help establish the relationship between each generation.
For families from Buffalo, the Canadian ancestor may have come from Ontario because of the province’s geographic proximity to the city across the Niagara River.
Ontario began civil registration in 1869. Earlier births may therefore require church or other historical records instead of government birth certificates.
Applicants should gather records for every generation between themselves and the Canadian-born ancestor. Names, dates and places should match across the documents as closely as possible.
As of September 2026, Immigration, Refugees and Citizenship Canada estimates that proof of Canadian citizenship applications take about 33 months to complete.
People researching a possible Canadian connection can begin by examining family records, old census documents and naturalization papers. Establishing the Canadian-born ancestor is the first step, but applicants must then document the entire direct line connecting that ancestor to themselves.
Methodology: The 1900 figures come from Table 8a of the United States Census Bureau’s Abstract of the Twelfth Census, which classifies the foreign-born population of large cities by country of birth. The table’s Canada figure includes people born in Newfoundland, which did not join Canada until 1949.
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