1. Ethnicity describes shared culture including practices, values, beliefs, language, religion and traditions among a group. Like race, the term ethnicity is difficult to define and has changed over time.
2. The U.S. Census categories have changed over time to reflect changing views of race/ethnicity and political conflicts over these views, and in turn helped shape later discussions. Relatively minor phenotypical or customs differences are used to categorize groups and attach socially constructed meanings to them.
3. Ethnic and racial identities are shaped by both external ascription and internal identification, though some groups like whites have more choice than minorities with identifiable physical or name markers.