Sean W. answered 01/24/17
Tutor
5.0
(50)
Biomedical Engineer from Vanderbilt
Hi Starlet,
This is a very open-ended question and everyone can have different opinions. However, I think that the main reason is that water is extremely important to human life. We cannot live without water. Thus, living next to a water source would be beneficial to turn away from the hunter-gatherer lifestyle and begin developing civilizations.
Another possible theory is that as they shifted lifestyles, from hunter-gathering to staying in one location, the often, not always, fertile soil provided by seasonal or annual flooding by the nearby valleys enabled bountiful harvests.
Eventually, rivers were used as a means of trading. It was much easier to navigate down, not always easy going upriver, a river to trade than to cross through wide plains or the other landscapes just to trade with the neighbouring civilization.
If you have a textbook, you can definitely find more reasons in there. You can also ask a question and give your own explanation.
Hope this helps!