Answer:ethnocentric.
Explanation:
Ethnocentrism is when someone judges another ethnic group which is not theirs based on the preconceived ideas which are mostly untrue .
These preconceived ideas are usually driven by comparing one's own values,religious beliefs and customs to the other ethnic group and judging them based on that.
In most times it involves viewing your own ethnic group positively whilst you view the other ethnic group negatively .
The north of the US did not want slavery while the south did want slavery. they had a war over it (the civil war) the north won and slavery was abolished.
We know this thanks to archaeologists who excavated many places and discovered that many early civilizations gathered around large rivers where they could develop agriculture. This was seen in places such as Mesopotamia, India, China, Egypt, etc.
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hope this one is right