Write a 5 page essay about Africa history

This is the instruction:

During the first part of the semester we discussed major themes which shaped pre-colonial Africa’s historical experience. Write a 5 page double-spaced essay examining those themes and concepts which characterized Africa’s changing civilization between 1770 and 1875. Conclude your essay by pointing to what you consider to be emerging patterns in the continent’s story. Support your arguments with substantial historical evidence.

You can use the ppt that I upload below.