Jazz is not like all of this, where new genres replace the old ones. Instead:

all the jazz genres are brought in and out of the spotlight. It also happens in just a hundred years!

20th Century

• 1910s: Ragtime (Jazz is just invented, but new)
• 20s: Dixieland, New Orleans Jazz, Symphonic Jazz
• 30s: Swing Era (HUGE)
• 40s: Bebop (taking the swing to the next level, run by hotshots, but some people reacted against the escotericness)
• 50s: Cool/West Coast Hard Bop
• 60s: Modal and free Jazz, Avant-garde
• 70s: Jazz Fusion (primarily mixing jazz with rock)
• 80s: Smooth Jazz (the easy background jazz, easy to make fun of)