Which of these events occurred first?

the fall of the songhai empire
the fall of the mali empire
the introduction of islam into west africa
the entrance of portuguese explorers into african territory

Write a 5- paragraph that explains the three main causes of the overthrow (mahele, reciprocity treaty and the bayonet constitution). say why each was a factor that led to the eventual overthrow. choose one that you think was the most important and explain why. make sure you have a thesis statement in your introduction, and a strong concluding paragraph.