It seemed like we saw it as a theme heavy in the early 90s why did it seem to largely die out?
Two reasons
It came primarily from Professor Molefi Assante at Temple University. Became trendy in academic and literary circles.
. Buzz was strong so books, lectures, talk show appearances opened up to the self promoting "conscious crowd"
In a money grab some other writers/teachers began to REACH with some of their writings. Published things that they weren't capable of proving or defending. White historians went after them and tore some of them apart.
The late Dr. John Henrik Clarke who was a scholar decades before "Afro-centricity" was a trend, had to come in, clean up the mess that the grifters left, and put those white historians back in their place.
Dr. Assante got railroaded out of Temple by backstabbers, around the same time the grifters were being exposed. So the real deal dept. and person who was leading Afro-centricity was muted.
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In general culture, trends catch on....become popular, and then die off. Rise and fall of Afro-centricity mirrored what happened with early mass cultural movement of the 60s/70s.