How did the atomic bomb impact japanese society.

The order is:

4. The gold-salt trade flourishes on the trans-Saharan route.

1. Tiles Islam spreads to western and southern of Africa

3. Arabs come into North Africa.

2. All of North Africa comes under Muslim rule.

Explanation:

From the 7th century CE, trans-Saharan trade linked the Mediterranean economies, where can supply salt, to the sub-Saharan economies, where gold was abundant, flourished.

In 613 CE, The Sahabah fled from the persecution of the ruling Quraysh tribe of Mecca and sought refuge in the Christian Kingdom of Aksum, present-day Ethiopia and Eritrea, in the Western Africa. It's known as First Hegira.

Later, Muslim troops took over current Egypt and then Libya.

In the 8th century CE, Muslim controlled the entire of North Africa and crossed the Strait of Gibraltar to Europe.