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.
The crusades had a huge financial impact on the fudal system as lords and Barrons sold assets and much of their property to Finance crusading, Manny of these men died and left their families in debt, those that were too old for war lost sons an heirs also leaving behind bebt, this led to what we would now call a great recession.
C-Declare independence and establich a republic
