Any time you get enough deaf people in one place, who don't already have a signed language, they invent one. In times and places where signed languages have be

Any time you get enough deaf people in one place, who don't already have a signed language, they invent one. In times and places where signed languages have been suppressed, they've popped up all over the place at schools for the deaf. There's not much reason for any of the languages to share grammar and such with each other, since they're effectively unrelated. You wouldn't expect Japanese and Navaho to use similar grammar or vocabulary, right? Same here. [Not Deaf, but I studied ASL and deaf culture for a few years at 2 colleges and in private lessons.]