British Americans

British Americans usually refers to Americans whose ancestral origin originates wholly or partly in the United Kingdom (England, Scotland, Wales, and Northern Ireland and also the Isle of Man, the Channel Islands, and Gibraltar). It is primarily a demographic or historical research category for people who have at least partial descent from peoples of Great Britain and the modern United Kingdom, i.e. English, Scottish, Welsh, Scotch-Irish, Orcadian, Manx, Cornish Americans and those from the Channel Islands and Gibraltar.

Based on 2020 American Community Survey estimates, 1,934,397 individuals identified as having British ancestry, while a further 25,213,619 identified as having English ancestry, 5,298,861 Scottish ancestry and 1,851,256 Welsh ancestry. The total of these groups, at 34,298,133, was 10.5% of the total population. A further 31,518,129 individuals identified as having Irish ancestry, but this is not differentiated between modern Northern Ireland (part of the United Kingdom) and the Republic of Ireland, which was part of the United Kingdom during the greatest phase of Irish immigration. Figures for Manx and Cornish ancestries are not separately reported, although Manx was reported prior to 1990, numbering 9,220 on the 1980 census, and some estimates put Cornish ancestry as high as 2 million. This figure also does not include people reporting ancestries in countries with majority or plurality British ancestries, such as Canadian, South African, New Zealander (21,575) or Australian (105,152). There has been a significant drop overall, especially from the 1980 census where 49.59 million people reported English ancestry and larger numbers reported Scottish, Welsh and Northern Irish ancestry also.

Demographers regard current figures as a "serious under-count", as a large proportion of Americans of British descent have a tendency to simply identify as 'American' since 1980 where over 13.3 million or 5.9% of the total U.S. population self-identified as "American" or "United States", this was counted under "not specified". This response is highly overrepresented in the Upland South, a region settled historically by the British. Those of mixed European ancestry may identify with a more recent and differentiated ethnic group. Of the top ten family names in the United States (2010), seven have English origins or having possible mixed British Isles heritage (such as Welsh, Scottish or Cornish), the other three being of Spanish origin.

Not to be confused are cases when the term is also used in an entirely different (although possibly overlapping) sense to refer to people who are dual citizens of both the United Kingdom and the United States.^{[citation needed]}

Americans of British heritage are often seen, and identify, as simply "American" due to the many historic, linguistic and cultural ties between Great Britain and the U.S. and their influence on the country's population. A leading specialist, Charlotte Erickson, found them to be ethnically "invisible". This may be due to the early establishment of British settlements; as well as to non-English groups having emigrated in order to establish significant communities.

Table below shows census results between 1980 (when data on ancestry was first collected) and the 2020 census. Response rates for the question on ancestry was 83.1% (1980) 90.4% (1990) and 80.1% (2000) for the total population of the United States.

According to estimates by Thomas L. Purvis (1984), published in the European ancestry of the United States, gives the ethnic composition of the American colonies from 1700 to 1755. British ancestry in 1755 was estimated to be 63%, comprising 52% English and Welsh, 7.0% Scots-Irish, and 4% Scottish.

The ancestry of the 3,929,214 population in 1790 has been estimated by various sources by sampling last names in the very first United States official census and assigning them a country of origin. There is debate over the accuracy between the studies with individual scholars and the Federal Government using different techniques and conclusion for the ethnic composition. A study published in 1909 titled A Century of Population Growth by the Census Bureau estimated the British origin combined were around 90% of the white population.