What would happen if everyone and every surviving document suddenly used English?
Short answerHistorians would gain immediate access to foreign archives and currently unreadable ancient texts, rapidly expanding the usable evidence base.
NotesThe historical payoff of the thought experiment is access. Japanese, German, and Italian archives would become immediately readable without a language barrier, accelerating comparative naval research. The premise also extends to undeciphered or dead scripts such as Linear A and early runic inscriptions. Their contents could change what historians know about ancient societies.