The United Kingdom is the correct answer to a question on the Pioneer Scout camp rail enthusiast exam. The musician exam mentions British songwriters.
When impersonating a slaver to get into the Watoga Civic Center, Johnny Weston pretends to be one Reginald P. Humphries, an Englishman who was unable to get home after the Great War. He also mentions his origins may be from the country.
The United Kingdom, England, or Britain are mentioned in Fallout 3, Fallout Tactics, Fallout 4, Fallout Shelter, and Fallout 76.
Behind the scenes
In a Fallout 3 afterthoughts feature, Emil Pagliarulo mentions Allistair Tenpenny, in that he traveled to the Capital Wasteland from Great Britain in order to seek his fortune. Pagliarulo stated that by mentioning small details about the state of the rest of the world, characters like Tenpenny can "serve as a catalyst" for players' imaginations.[Non-canon 2] Tenpenny is also described as an Englishman in the Fallout 3 Official Game Guide.[Non-canon 3]
↑Lone Wanderer: "What's the history behind the document?" Abraham Washington: "On July the 4th in 1776, a group calling themselves the Second Judgmental Congress got together at Fort McHarry in Maryland. After a ceremony which ended with Paul Revere singing the famous battle hymn known as the National Anthem, the document was signed. From there, it was sent to England by plane presumably and presented to King George himself. Thus began the Evolutionary War." (Abraham Washington's dialogue)
↑Fallout 3 loading screen: "Tenpenny Tower is the brainchild of Allistair Tenpenny, a British refugee who came to the Capital Wasteland seeking his fortune."
↑The Lone Wanderer: "Why would you do all that over a scrap of paper?" Button Gwinnett (robot): "This is no mere scrap of paper, sir/madam. This is the doctrine laid down by my fellow members of the Second Continental Congress. It absolves us of the tyranny of King George the Third of Great Britain. It is perhaps the greatest symbol of this free nation." (Button Gwinnett (robot)'s dialogue)
↑Point Lookout loading screens: "The Ark & Dove Cathedral is named for two English settler ships which landed near Point Lookout in 1634, leading to Maryland's founding."
↑Voice via Tour Bot: "Let us go back hundreds of years. It is the year 1775. For seven years, thousands of British soldiers have camped on this very soil in their orderly rows of tents. Led by General Thomas Gage, they seek to quell the growing tide of Revolution." (Tour Bot dialogue)
↑Wixon's Shovel Museum plaque: "British Shovel Fighters were some of the most feared and deadly warriors of the Revolutionary War. They were known for their pristine ditches and the uncanny ability to deflect rifle shot."
↑Johnny Weston: "When the bombs dropped, I was living in New York. Or maybe, Boston. Or coulda been Detroit, or LA. Maybe even England." (Johnny Weston's dialogue)
↑Fallout Tactics text file: "Name_CORE_rec_tr02 = Sharon/desc_CORE_rec_tr02= Her mother can trace their bloodline all the way back to Essex England, or so she says. Sharon spends a lot of time working on her hair. Her vanity can be a distraction, but Sharon handles guns well enough to keep her out of trouble."
↑Fallout Tactics text file: "Name_CORE_rec_tr02 = Martin /desc_CORE_rec_tr02= One of Martins ancestors used to run a software company in England, until it sank. Martin himself has inherited his ancestor's uncanny driving abilities, and when out of the car is very good at spotting and disarming traps."
↑"The 9mm Sten gun was developed by the British during WW2 as a cheap alternative to the more expensive Thompson SMG offered by the U.S. The Sten proved to be extremely reliable and, due to its fairly loose tolerances, could perform in poor conditions much more reliably than ostensibly better weapons." Fallout Tactics weapon description
↑"This British adaptation of a Czech design was adopted as the standard light machine gun of British and Commonwealth forces in 1938. The .303 Cal Bren was among the most liked and respected weapons available to the British in WW2, due to its exceptional ruggedness, accuracy and simplicity, and remained in service with British forces for almost 50 years." Fallout Tactics weapon description
↑Emil Pagliarulo: "Allistair Tenpenny came to the Capital Wasteland from Great Britain to seek his fortune, so that alone tells you that the U.K. was also hit in the war. And if he came to U.S. to succeed, that says a lot about how screwed up Europe must be. So we just allude, a little bit, to the state of the rest of the world. We like to leave a lot to the players' imaginations, and somebody like Tenpenny serves as a catalyst for those thoughts." (Fallout 3 Afterthoughts)
↑Fallout 3 Official Game Guide Game of the Year Edition p. 60: "Allistair Tenpenny an 80-year-old Englishman turned American entrepreneur, the man who discovered the tower saw it as an opportunity to provide residents with a standard of living enjoyed by the affluent in the days before the nuclear Armageddon. A rich eccentric who's bored with life and looking for new challenges, he enjoys sniping at wasteland creatures, ghouls, and the occasional visitor from his suite atop Tenpenny Tower."