In ancient Egypt, there was a social class pyramid with Pharaohs on the top and slaves on the bottom with middle classmen in between. In the same way, the Tigris-Euphrates river valley civilizations also had a social ladder however instead of Pharaohs there were kings and nobles. These social classes caused a rift between the people, granting too much power to some and too little to others. Additionally, earlier river societies often practiced patriarchy, raising the value of men above women. Concerning inequality between social classes and gender, first and second-wave civilizations shared a common ground. Second-wave empires continued to use social ladders such as the caste system in India. These social structures however, became much more strict and rigid. Furthermore, the margin of difference between social classes widen significantly. In comparison, second-wave empires imposed a firmer hold on women subordination, whereas river valley civilizations were less restrictive.
Both first and second-wave civilizations claimed to have leaders that are spiritual connected to the gods, share a couple of innovations, have a social class system, and practice patriarchy. More pronounced, though, are the points that cause the earlier river societies to differ from second-wave empires. In sum, second-wave empires produced new political concepts – such as the concept