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 .
Southerners wanted to develop industry because they relied on the North for their industry, but since they were in a war the North was not giving them anything.