It originally came from New Orleans
Blues.
native american
folktale
African American
Blues evolved into jazz.
jazz and blues
Rhythm and Blues
The ethnic group that is credited for creating jazz music and maintaing its strong presence in American life is....African Americans.
When acid jazz came along it did not really kill off any form of music but it did combine elements of jazz, funk and hip-hop. So it could be said to have reduced the popularity of those genres although not by any great degree.
Rock may have had some aspects come from Jazz, but it hasn't turned "into" rock persay. Jazz music is very different from the Rock genre in many ways. If rock was developed from any genre, it would be more closely due to blues, country, and gospel. Hope this helps.
Jazz evolved partly out of gospel music of the African-Americans, and partly out of their "field hollers" they would call back and forth while at work. They began to experiment with the rhythms, and jazz evolved out of that. Improvisation is a basic tenet of jazz (and blues). There is also an old joke that jazz was invented when a cow swallowed a bottle of ink and "mooed indigo". :>D
Jazz came from new oreleans, Louisiana