The book "Twentieth Century American: A Comparative Study of the Peoples of Two Great Anglo-Saxon Nations" by Harry Perry Robinson is an important study that offers a comparative view of the sociocultural and historical characteristics of Americans in the twentieth century. The author begins to analyze and compare the national characteristics of citizens of the United States and Great Britain, examining the influence of their history, culture and society on the formation of national character. Through an in-depth comparative analysis, the author reveals the commonalities and differences between these two nations, noting the key events and trends that shaped their identities during the twentieth century. The book offers the reader a deeper understanding and appreciation of the uniqueness of each nation, as well as their mutual relations and mutual support on the world's historical stage.