As a civilization develops, government is needed to balance any decisions, religion, and/or way of life. Without a central government, a civilization is most likely split into separate groups to survive, whereas with a government everyone can work and fight together. I hope this helps :D
Highly complex or intricate and occasionally was different from the western roman empire.
In an era prior to the safe roads, all the people used the rivers to transport their goods, since it was much faster and safer than going in carabanas by the desertic roads, and full of bandits; In addition, the country's rivers, such as the Mississippi, the Ohio, the Missouri River, and Illinois, were used as a means of transportation and also to link to man-made canals, such as a waterway, by which farmers in Louisiana and many states found this form of transportation very useful and became so popular that large channels were formed that united important cities such as the Eirie Channel connecting New York to the Atlantic market.
