What geographic feature in North Africa served as a barrier separating it from the rest of the continent?

the sahara desert serves as a natural barrier that separates it from the rest of the continent

in 32-page handwritten address, washington urged americans to avoid excessive political party spirit and geographical distinctions, in foreign affairs he warned against long-term alliances with other nations. the address was printed in philladelphia's american daily advertiser on september 19, 1796

americans experinced rations on food and be gangrene their own food and feed their families going to go over jobs that were orginally only for men.