For many decades, bald eagles were hunted for sport and for the "protection" of fishing grounds. Pesticides like DDT also wreaked havoc on eagles and other birds. These chemicals collect in fish, which make up most of the eagle's diet. They weaken the bird's eggshells and severely limited their ability to reproduce. DDT was heavily restricted in 1972.
American Bald Eagle Information - Bald eagle (Haliaeetus leucocephalus), our national bird, is the only eagle unique to North America. Description from thefemalecelebrity.info. I searched for this on bing.com/images