Szlia
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American sign language was developed at a time schools in the South were segregated. Apparently there are a lot of local dialects of American Sign Language because there are not that many schools and not a lot of interactions between people that learned and taught in different schools, add segregation in the mix and you have a group of Black American Sign Languages in the South. I think there is a good deal of mutual intelligibility between these dialects and families, but enough differences for them to be considered different things. That being clarified, It makes sense when you have a movie set in a black community in the South to have BASL as an option.
