Around 220 B.C., Qin Shi Huang, the first emperor of a unified China under the Qin Dynasty, ordered that earlier fortifications between states be removed and a number of existing walls along the northern border be joined into a single system that would extend for more than 10,000 li (a li is about one-third of a mile) .
Explanation:
First Arabs came into North Africa, then gold-salt trade flourishes on the Trans-Saharan route, then Islam spreads to Western and Southern Africa, then all of North Africa comes under Muslim rule
Answer:stay home
Explanation: because I get to have a better relationship with my family
