Scroll to the bottom of the page to read the article "federal versus state governments." in a federal system, political power is shared. what are the benefits of this sharing?

It basically gives stability and tranquility to all the states, if the federal government is too much, stronger states can prey on weaker states looking for their wealth. The Federal System stablishes general rule sto be shared with all the states and the states have their degree of freedom to enfore some laws according to their own context.

these civilizations were located around fertile rivers, where they could produce an abundance of crops