Why isn’t there a universal sign language? One that everyone around the world could learn so that they would be understood no matter where they lived, or travelled to? Who decided it was a better idea to have more than one?
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Same reason there isn’t a universal spoken language or a universal written language.
And sign language users generally need to be fluent in reading and writing the local language, so it would be a pain to need to be fluent in two completely different base languages, when day to day you are only conversing with local people.
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