The document defines ethnocentrism as viewing one's own group as central while believing other groups are inferior. It was coined by William Graham Sumner and involves strongly identifying with one's own culture while rejecting others. Ethnocentrism can lead to stereotyping other groups and issues in the workplace if a single language is enforced. Examples of ethnocentric views in the US include thinking American practices are superior to others in areas like driving, alcohol laws, and language use in schools and businesses.