Reddit mentions of Jazz Dance: The Story Of American Vernacular Dance

Check out Spirit Moves. You can start here and search from there, though it is copyrighted and therefore gets taken down.

https://www.youtube.com/watch?v=EcqYQC0_t3I

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This Book Jazz Dance by Marshall Sterns

https://www.amazon.com/Jazz-Dance-Story-American-Vernacular/dp/0306805537

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Ken Burns Jazz is a good start too
https://www.amazon.com/Jazz-Film-Ken-Burns/dp/B000BITUEI/ref=sr_1_2?keywords=ken+burns+jazz&qid=1562692802&s=gateway&sr=8-2

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Remember no history is definitive, there's always other perspectives, revisions, corrections and new information. And also only about 10% of the documentaries, movies, etc out there ever made it onto the internet, and about 5% or less of the researched history has been converted to digital form, so go to the library too if you're serious about getting accurate info.