Why did people migrate away from the sahel around 4,000 years ago

Approximately 4,000 years ago the climate of the Sahel became extremely dry which resultedly caused the shrinking of the rivers and desertification. Obviously, this region was no longer favourable for farming and harvesting, so people who lived on those territories were forced to migrate to the more humid territories of West Africa.

go up to your profile picture in the top right hand. click on it. then click on edit profile. there you shall see delete account

i am not 100% positive but i think it is is b. both are non-partisan jobs

i am pretty sure that members of congress have term limits, can be impeached, and are nominated through direct popular vote.