The way the world is divided up into different sign languages is completely different from how it is with spoken language. For example, people in the U.S. use almost the same sign language as people in Bolivia and Costa Rica, but one that is totally unrelated to British Sign Language.



ADDITIONS/CORRECTIONS:
Really, I should have redone the first map when I saw this, but the BSL-family languages ("BANZL") should also include Namibia and Angola in southeastern Africa -- I read that both countries use Namibian Sign Language, which was based on South African Sign.
Also, by the way, the German and Austrian sign families also descend from Old French Sign.
A big problem too is that there's not always a lot of agreement among different sources as to which sign languages are related to which, and how closely related they are, at least from what I could find for this video.



Photos in this video include the works of:
Ave Calvar Martinez
Pixabay
Petr Dlouhý
Jo Hilton
ŠJů
NastyaSensei
Gratisography
Jon Tyson
Getty Research Institute Open Content Program
Aubrey Odom
Ilnur Kalimullin
Richard Huber
Polina Zimmerman
Lê Minh
(Note: For this video, I lost some of the photo credit list -- if you see an image of yours in this video and you're not credited here, please shoot me the link to the photo, and I will add the name. Thanks!)