This chapter synthesizes Hsu’s key theoretical contributions—Psychosocial Homeostasis, the Dominant Dyad Hypothesis, and the Secondary Group Hypothesis—to construct a psychocultural framework for analyzing the internal organization of national communities in literate civilizations. Through comparative analysis of Chinese, American, and Hindu societies, it demonstrates how dominant kinship relationships shape secondary group formation, social solidarity, and national character. The chapter introduces the concept of psychocultural orientation to explain how individuals mediate between cultural ideals and everyday behavior under internalized affective patterns. Behavioral tendencies such as conformity,competition, and emotional release are examined as social expressions of basic psychological needs. This framework reveals how the cohesion of national communities arises from the integration of affect, culture, and social structure. The chapter concludes by addressing critiques of Hsu’s model and affirming its theoretical significance as a conceptual map for understanding the structural logic of different civilizational orders.