The document discusses the concepts of community, ethnicity, race, and nation from an anthropological perspective. It explains how early anthropology viewed "community" as a taken-for-granted concept but now anthropologists study how communities are formed and imagined. Communities are imagined and defined by shared beliefs and identities rather than physical co-location. Race, ethnicity, and nationality are also socially constructed concepts with shifting and arbitrary definitions over time. Census categories in Singapore from 1871 to 2000 demonstrate how racial and ethnic classifications have changed.