This work investigates the historical trajectory of American wildlife conservation and the anthropogenic factors that have driven numerous species toward extinction or endangerment. Robert M. McClung, an established naturalist and author, synthesizes decades of environmental policy shifts and ecological data to document the decline of North American fauna. The text provides a comprehensive framework for understanding how legislative actions and societal attitudes have shaped the survival prospects of diverse species from the colonial era through the early 1990s.

This text serves as a foundational reference for understanding the historical context of American conservation efforts up to the early 1990s. The scope of the research provides a clear, documented overview of the challenges faced by endangered species and the evolution of environmental policy in the United States.