When king Menes united the kingdoms of upper and lower Egypt by establishing a succession of rulers from the same family, he founded the first Egypt dynasty.
After his victory over the Set people, Menes, leader of the Horus people- married Netihotpe princess, and that is how he could unify the lower and upper Egypt, approximately in the 3100 BCE. He was smart enough to show respect and tolerance to the religious beliefs of the North people and the decision was accepted by the people, who understood the necessity of establishing order to avoid confrontations.
The other options of the question were 1) religion. 3) democracy. 4) city.
In general, during the time of early America, this community embraced Christianity as a way of escaping the horrors of every day life, since they were promised salvation upon death.
