This work investigates the historical development, cultural diversity, and social structures of Indigenous peoples across the North and South American continents. Author John Collier, serving as a former U.S. Commissioner of Indian Affairs, utilizes his extensive administrative experience and anthropological observations to construct a comprehensive overview. He argues for the recognition of the inherent value and resilience of Indigenous civilizations, challenging prevailing colonial narratives of the mid-20th century. The text synthesizes historical records and ethnographic data to present a unified perspective on the survival of these diverse groups.

Scholars and historians often cite this work as a significant, albeit dated, attempt to synthesize the history of Indigenous peoples across the entire Western Hemisphere. Readers frequently note that while the prose is accessible, the text reflects the specific political and academic biases of its era.