One thing that makes piecing together the history of sub-saharan africa easier for researchers for oral histories. oral history is

Oral history is the transmission of historical knowledge orally over time. This means that the traditions, past, and historical events of groups of peoples are not written down in text or books but instead are transmitted through oral histories over time. Oral histories are common in cultures and societies all around the world including Sub-Saharan Africa. 

Explanation:

answer: i looked it up

explanation: in 1955 in montgomery, alabama, a girl refused to give up her seat on a public bus. the girl was black, and the passenger looking to take her seat was white. this is a familiar tale, but it's not about rosa parks. the girl in the story is a 15-year-old high school student named claudette colvin, and this act of defiance occurred nine months before rosa parks did the same thing. colvin was arrested, and her case is what led to the u.s. supreme court's order for the desegregation of alabama's bus system. so, why don't we know colvin's name? "later i had a child born out of wedlock; i became pregnant when i was 16," colvin says. "and i didn't fit the image either, of, you know, someone they would want to show off.

i think you may have asked this twice, but i answered one of the