Who would have imagined one fun dance could get groups so upset with each other that they would each take that same dance, give it their own name, and go set their own rules for how to do the same thing?
The essential difference between the emergence of Jive and its american counterparts was the music.. in the late 40s/early 50s there was a paradigm shift from 2/4 to 4/4, and the speed of the music speed increased, from the more sedate speeds of E and W coast swings .
The powers that be in the UK ( at that time ) were responsible for adapting the substantial changes .. the reason ?.. the Bop/Jive being done by the American forces, to them, looked out of control, and too wild for the general publics acceptance in the Ballroom world of the time..
My coaches ( as all I guess did ) were against it, if one was in the ballroom div (I still danced it on a regular basis ! ). ... many public ballrooms in the UK banned it !! ( some roped a section of the floor for "boppers " )
It ( the time sign. change ) also affected Quickstep..