Answer:
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.
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Answer:
To encourage railroad construction across the Great Plains, the federal government gave land grants to many railroad companies. The railroads then sold the land to settlers, real estate companies, and other businesses to raise money to build the railroad.
Explanation:
Industrialization led to larger areas being more devoted to producing goods meaning that exploration and pioneering were a priority