When Did Jazz Music Begin?

Jazz music began in the late of 19th century.it's style combines the black's with the white's.Just in the late 19th and early 20th century, the jazz band could only be called walking street performers .Until the 1920s, jazz became widely popular music at the mainstream.After entering the 1940s, the most emerging from the east to new york jazz musicians, who  regard the rise and fall of jazz musicians as introspection  , treat jazz seriously, they tend to insist on dressing pen stand when playing, because they are officially musician.they continuously pursuit for the liberation of black music originally,then it slowly came into being.