All of the three empires (Egypt, Sumer, and Indus) are similar because they all had a trading center and domesticated animals, and they also all had rivers. The largest similarity between the three civilization is that they all had their development of writing records. Recording down important events such as taxes, property lines, wars, and religious texts. This shows that all of the three civilizations recorded down important events that happened. In Sumer they wrote with a system called cuneiform