Though early assertions of being British date from the Late Middle Ages, the Union of the Crowns in 1603 and the creation of the Kingdom of Great Britain in 1707 triggered a sense of British national identity.[29] The notion of Britishness and a shared British identity was forged during the 18th century and early 19th century when Britain engaged in several global conflicts with France, and developed further during the Victorian era.[29][30] The complex history of the formation of the United Kingdom created a "particular sense of nationhood and belonging" in Great Britain;[29] Britishness became "superimposed on much older identities", of English, Scots and Welsh cultures, whose distinctiveness still resists notions of a homogenised British identity.[31] Because of longstanding ethno-sectarian divisions, British identity in Northern Ireland is controversial, but it is held with strong conviction by Unionists.[32]
Modern Britons are descended mainly from the varied ethnic groups that settled in Great Britain in and before the 11th century: Prehistoric, Brittonic, Roman, Anglo-Saxon, Norse, and Normans.[33] The progressive political unification of the British Isles facilitated migration, cultural and linguistic exchange, and intermarriage between the peoples of England, Scotland and Wales during the late Middle Ages, early modern period and beyond.[34][35] Since 1922 and earlier, there has been immigration to the United Kingdom by people from what is now the Republic of Ireland, the Commonwealth, mainland Europe and elsewhere; they and their descendants are mostly British citizens, with some assuming a British, dual or hyphenated identity.[36] This includes the groups Black British and Asian British people, which together constitute around 10% of the British population.[37]
The British are a diverse, multinational,[38][39] multicultural and multilingual people, with "strong regional accents, expressions and identities".[40][41] The social structure of the United Kingdom has changed radically since the 19th century, with a decline in religious observance, enlargement of the middle class, and increased ethnic diversity, particularly since the 1950s, when citizens of the British Empire were encouraged to immigrate to Britain to work as part of the recovery from World War II. The population of the UK stands at around 67 million,[42] with 50 million being ethnic British. Outside of the UK, the British diaspora totals around 200 million with higher concentrations in the United States, Australia, Canada, and New Zealand, with smaller concentrations in the Republic of Ireland, Chile, South Africa, and parts of the Caribbean.[1]
^ abRichards, Eric (14 May 2004). Britannia's Children: Emigration from England, Scotland, Wales and Ireland Since 1600. London: A&C Black (published 2004). pp. 3–4. ISBN9781852854416. Archived from the original on 28 September 2023. Retrieved 2 November 2020. [...] even the basic outline of the diaspora remains vague. It was never a controlled movement and it was mostly poorly documented. Migrants are always difficult to categorise and to count. [...] The scale of the modern British dispersion has been estimated at about 200 million, [...] or, counting those who can claim descent from British and Irish emigrants, more than three times the current population of the British Isles.
^ abcdeCite error: The named reference BritsAbroad was invoked but never defined (see the help page).
^2021 Canadian census results for Canadians identifying with full or partial British Isles, English-speaking 'Canadian', 'American', 'Australian', 'New Zealander', 'Albertan', 'British Columbian', 'Cape Bretoner', 'Manitoban', 'New Brunswicker', 'Nova Scotian', 'Prince Edward Islander', 'Saskatchewanian' and 'United Empire Loyalist' ancestry. According to Statistics Canada, many of those identifying with North American ancestries such as 'Canadian' are of British descent. "Immigration and Ethnocultural Diversity Highlight Tables". statcan.gc.ca. 25 October 2017.
^Census 2011: Census in brief(PDF). Pretoria: Statistics South Africa. 2012. p. 26. ISBN9780621413885. Archived(PDF) from the original on 13 May 2015. The number of people who described themselves as white in terms of population group and specified their first language as English in South Africa's 2011 Census was 1,603,575. The total white population with a first language specified was 4,461,409 and the total population was 51,770,560.