Answer:
Because of the high amount of American casualties and negative impact of the first world war
The wealth of these city-states were flourishing, and it is visible because of the infrastructure being built. Note that better infrastructure is an opportunity for better trade. Trade = wealth.
Jelly Roll Morton was a brilliant solo pianist and also an prominent bandleader. He developed ragtime and instrumental blues into a new ensemble style which embraced collective polyphony, solo improvisations, and ever-changing textures and timbres.
Morton's piano style revolutionized jazz by adding sharp notes, flat notes, different sounding 5th and 6th of notes. He spread his influence by roaming around world and later by on recording. Jelly roll introduced new ways in jazz. He helped in showing the way to African American musicians and singers in recording industry.
Whereas, The Harlem Stride was a jazz piano style that emerged in large cities of the East Coast. It is regarded as the first step taken beyond ragtime that brought improvisation and rhythmic enjoyment to the living rooms, nightclubs and Harlem.
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