In early human history conflicts occurred between individuals or ‘communities’ over scarce resources but since flight was an alternative the frequency of battles were fairly low. Once the ego-driven institution of the State (it looked quite different in its early stages) emerged then conflicts turned into wars with much more frequency and the subsequent power grabs incubated the later stages of the State that more closely resemble the modern day scourge.
Since it is an ego-driven institution, in the early stages it took on the characteristics of the aggressive and oppressive individual(s) who imposed his (mostly) or her ego-driven interpretation about what is best. In later stages the ego-driven institution of the State became a bureaucracy with the same ill-natured characteristics of aggression and oppression, only more powerful and less accountable.