The Dawn of Conservation Diplomacy: U.S.-Canadian Wildlife Protection Treaties in the Progressive EraIn the first decades of the twentieth century, fish in the Great Lakes and Puget Sound, seals in the North Pacific, and birds across North America faced a common threat: over harvesting that threatened extinction for many species. Progressive era conservationists saw a need for government intervention to protect threatened animals. And because so many species migrated across international political boundaries, their protectors saw the necessity of