On October 3, 1884 (August 15, 1884 in the lunar calendar), Engels published his book Family, Private Ownership and the Origin of the State 141 years ago. On October 3, 1884, Engels published his book Family, Private Property and the Origin of the State. Engels explained Morgan's research results with historical materialism and proposed that: due to the development of labor productivity, private property was produced, thus forming class and class opposition; due to the conflict between classes, the old society based on blood families was blown up and replaced by the new society that formed the country; the family system was dominated by ownership. According to Morgan's research on American Indian society, Engels supplemented his own research materials on ancient Rome, Greece and Germanic society, and discussed the history of the early primitive stage of human society and the formation of the early state of slave society. Later scientific archaeological discoveries also proved Engels 'basic thesis correct. In this book, Engels studied the origin, evolution and development of various prehistoric cultural stages and families, focusing on the characteristics of various prehistoric cultural stages of mankind, early marriage and several family forms developed from the primitive state, and pointed out that the emergence and final victory of monogamous families are one of the signs of the beginning of the civilized era. Engels elaborated on the basic characteristics of primitive society based on a large number of historical materials. It analyzes the process of the disintegration of primitive society and the emergence of private ownership and classes, and reveals the origin, class nature, and laws of development and extinction of the country. It is pointed out that the state, like classes and private ownership, did not exist from all along, but emerged at a certain stage of economic development. The state is a product of irreconcilable class contradictions, a tool for political rule by the economically dominant class, and a special public power that is above and increasingly divorced from society. Its role is to coordinate the contradictions among various classes. The state comes into being with the emergence of classes, and it will surely die out with the demise of classes. This book is an important achievement of Engels 'study of the country using historical materialism. It scientifically clarifies the relationship between the origin of family, private ownership, and class and the emergence of the country, and greatly enriches the Marxist political theory. Comments: A good book that explains the materialist view of history. Those studying philosophy should read it