What event in Europe led to the Middle Ages? *
The fall of the Byzantine Empire
The collapse of the Roman Empire
The Black Death
The Renaissance

Early civilizations were often unified by religion—a system of beliefs and behaviors that deal with the meaning of existence. As more and more people shared the same set of beliefs and practices, people who did not know each other could find common ground and build mutual trust and respect.
It was typical for politics and religion to be strongly connected.

In some cases, political leaders also acted as religious leaders. In other cases, religious leaders were different from the political rulers but still worked to justify and support the power of the political leaders. In Ancient Egypt, for example, the kings—later called pharaohs—practiced divine kingship, claiming to be representatives, or even human incarnations, of gods.

Both political and religious organization helped to create and reinforce social hierarchies, which are clear distinctions in status between individual people and between different groups. Political leaders could make decisions that impacted entire societies, such as whether to go to war. Religious leaders gained special status since they alone could communicate between a society and its god or gods.

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Earth, Water, Air, and Fire. The ancient Greeks believed that there were four elements that everything was made up of: earth, water, air, and fire. This theory was suggested around 450 BC, and it was later supported and added to by Aristotle

The flow of pioneers and settlers through territory of American Indians provoked their resentment and caused attacks.