Why is So Much African Music Written for Choirs?

I had a question, I wanted answers. Why there so much African music in the "World" music category for choirs? This week, I decided to discover the answer to that question, and to see what I could find!

Music used:
Waltz in B minor Op. 69 no.2 - Chopin
Oh By Jingo! - All Star Trio
Chromatic Rag - Mini Vandals
Pale Rider Blues - Mini Vandals
Swipsey Cakewalk - Scott Joplin
The Great One Step - Victor Dance Orchestra

Sources:
https://docs.google.com/document/d/1Ohgy0GGom7ddOV39HJnVA_ctKFNgnE6fWXtzyxwaF58/edit?usp=sharing

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