The concept, as studied within the context of Advanced Placement Human Geography, centers on a classification system based on perceived physical or biological characteristics. These characteristics are often used to create hierarchical distinctions between groups of people. For example, historically, skin pigmentation has been used as a classifying trait, despite the scientific understanding that human variation exists along a continuum and that these features are superficial reflections of adaptation to different environments.
Understanding this concept is crucial in the field of human geography because it helps to analyze patterns of spatial inequality and social stratification. It reveals how socially constructed ideas have shaped migration patterns, residential segregation, and access to resources and opportunities across different populations. Furthermore, a historical perspective on this classification scheme illuminates the evolution of discriminatory policies and practices that continue to influence the cultural landscape.