The correct answer is Indus.
The Yellow River was an important part of Chinese civilization.
The Tigris River was an important part of the Mesopotamia civilization, located in modern day Iraq.
The Amazon River is located in South America, and was an important part of several different civilizations.
This shows that the only correct answer can be Indus River.
Going back to free 300 more slaves after she made it to the northern states.
Answer and Explanation
The trade helped to develop African societies in Maghreb Western Africa that later influence the rise of the Mali Empire.
African Gold-Salt trade brought the Arabs to Africa, leading to Arabic conquest that influenced western Africa societies due to introduction of trade.
There was spread of Islam into Africa through the trade routes of West Africa. Trade of Gold and salt saw the rice of government structures under chiefs who ruled under the kinship systems.
The development of empires grew larger with increased trading of gold and salt in Trans-Saharan trade routes. Trades from the east brought in weapons such as swords that lead to military force developments.
