People were angry about the terrible losses in world war 1
The League of Nations did not do as well as it could have because the United States did not participate in it.
The decision effectively stated that states could not be 'free' or a 'slave state' because its unconstitutional for states to exclude slave ownership in territories. The decision also stated that slaves were not citizens, thus could not sue in federal court. The best answer is that slaves were not citizens.
Arguably it became a agrarian society
In Mesopotamia, priests were equal to the king in power, they were basically the middle ground between God and human beings. They depended on the priests to help them be closer to their Gods, providing success in every area of life