Answer:
there are many languages in sub sahara africa partially due to many different empires and countries taking this land, making their own colonies in the land, and turning it into a trade hub, becoming essential to the conquerers economy
Step-by-step explanation:
many places came and wanted to exract things such as jewels and oil from subsahara africa. african dialect was extremely different from any other part of the world, and when countries such as britain and france came in and forcefully placed themselves on the land, the french and brits did not attempt to learn the dialect of the area. for example, cote de ivory or, also known as ivory coast was a french territory, as you may be able to notice from the french name.
another reason for such a large amount of different dialects and languages in sub sahara africa is separation. there were many tribes and villages that did not have much if any contact with other tribes. even if the entire continent had spoken one same language at one point in time, separation from others ensures that that one orignal language will shift, be modified, and change over time.
more so, when these dialects or introduced to another dialect (for example, if more efficient forms of transportation were introduced, allowing the people to travel farther from their homes), a new dialect could be formed over time.
over times, languages develop sub languages which develope into regional dialects with then break up into many different forms. these differents branches of the one language mix and change and then over time there will be hundreds or even thousands of different languages, such as in sub sahara africa