250 years on: How American English carved out its own identity from British roots

American English has evolved far beyond a regional variation of British English, developing its own vocabulary, spelling, and expressions over the past 250 years while profoundly influencing the way English is spoken around the world.

According to a BBC report marking the 250th anniversary of American independence, the linguistic split between Britain and the United States reflects not only geography but also centuries of political, cultural, and social change.

Although the two nations continue to share the same language, American English has established a distinct identity that continues to shape global communication.

One of the earliest advocates for an independent American language was former US president Thomas Jefferson, who argued that the young nation required a vocabulary capable of reflecting its unique environment and society.

"So great growing a population, spread over such an extent of country, with such a variety of climates, of productions, of arts, must enlarge their language, to make it answer its purpose of expressing all ideas, the new as well as the old," he wrote in a 1813 letter.

He added, "The new circumstances under which we are placed call for new words, new phrases, and for the transfer of old words to new objects."

Jefferson also argued that while British English might remain "stationary", American English would continue to evolve.

"Its new character may separate it in name as well as in power, from the mother-tongue."

The emergence of American English was not universally welcomed. Even before US independence, British writer Samuel Johnson criticised the language's evolution, defining the "American dialect" in 1756 as "a tract [trace] of corruption to which every language widely diffused must always be exposed."

Language experts say American English developed naturally as settlers from across Britain and Europe mixed, reducing many regional differences before gradually forming distinct local accents across North America.

The movement was later reinforced by lexicographer Noah Webster, who sought to establish a uniquely American linguistic identity through dictionaries, grammar books, and spelling reforms.

Writing in 1789, Webster declared, "A national language is a band of national union. Every engine should be employed to render the people of this country national."

He added, "As an independent nation, our honor [sic] requires us to have a system of our own, in language as well as government..."

Webster's reforms eventually standardised spellings such as 'honor' instead of 'honour', 'center' instead of 'centre', 'draft' instead of 'draught', and 'traveled' with a single "l". 

Although some of his more radical proposals, including spelling 'tongue' as 'tung' and 'leather' as "lether", failed to gain acceptance, his American Spelling Book became one of the most influential publications in US history.

American English also expanded by borrowing words from Indigenous languages and immigrant communities. Terms such as 'skunk', 'raccoon', 'chipmunk', 'moose' and 'caribou' originated from Algonquian languages, while words like 'prairie' and 'cookie' entered English through French and Dutch influences.

Some American expressions later crossed the Atlantic and became common in Britain. The word 'deadline', now widely used in workplaces, originally referred to a boundary during the US Civil War that prisoners crossed at the risk of being shot.

At the same time, several words now widely regarded as American were once common in Britain. Linguists note that 'fall' for the autumn season had been used in England since the 16th century, before largely disappearing there while remaining popular in North America.

Other terms that developed distinctly American associations include 'soccer', 'mad' to mean angry, 'smart' for clever, 'cooties' and the past participle 'gotten'.

Despite these differences, scholars say constant interaction between Britain and the United States prevented the two varieties from becoming separate languages.

"If the split in the language had happened 500 years before, then maybe we would be speaking different languages," said linguist Lynne Murphy.

"But we've got so much contact. Just the fact that the printing press existed when the split happened meant that people were always in touch with the English back in Britain."

Research has also shown that language in the United States continues to evolve rapidly. Modern slang such as 'amirite', 'lituation', 'cosplay', 'boolin' and 'lordt' has emerged from different regions, with researchers finding that many recent innovations originated in African American communities.

According to linguists, social media has accelerated the spread of new vocabulary, allowing regional expressions to gain national and international popularity more quickly than ever before.

More than two centuries after Jefferson predicted American English would forge its own path, experts say the language has not separated from British English but has instead enriched the shared language with new words, expressions and cultural influences used by millions around the world.