The goverment was not strong enough to keep the articles of confederation
I am pretty sure that many villages in the Sahel have been settled at the edge of the Sahara. I choose the option C because It seems to me that you are referring era of Sahelian Kingdoms and If so, most odf them were settled <span>at the edge of the Sahara. Do hope you will find it helpful!
Regards.</span>
I would say mexico
explanation: