Why were there so many different cultural groups in Mesopotamia?

Below the upper class was a small middle class made up of craftsman, merchants, and civil servants. They could make a decent living and could work hard to try and move up in class. The lower class was made up of laborers and farmers. These people lived a harder life, but could still work their way up with hard work.

Explanation:

william marbury filed suit against secretary of state james madison because madison refused to deliver the justice of the peace commission former president john adams awarded marbury under the organic act of 1801.