The cultural differences among groups may consist of ethnic heritage, values, traditions, languages, history, sense of self, and racial attitudes. Any of these cultural features can become barriers to working together. ... As people from different cultural groups work together, values sometimes conflict.
Answer:
It all began when the Romans overthrew their Etruscan conquerors in 509 B.C.E. Centered north of Rome, the Etruscans had ruled over the Romans for hundreds of years. Once free, the Romans established a republic, a government in which citizens elected representatives to rule on their behalf.
Then the Great Roman Empire started its supports in its historic construction.
Source:
https://www.ushistory.org/civ/6a.asp
The Atlanta campaigns and the Savannah campaign