Yes, it is an endangered species; they are considered "threatened" in Michigan, Minnesota, Oregon, Washington, and Wisconsin. The reason for this is a chemical known as DDT (dichloro-diphenyl-trichloroethane) that was being used in farmlands and other places to kill pests. The chemical got into the streams,, ponds, lakes, and rivers, poisoning the fish that the eagles preyed on. This went on for quite some time' the chemical was supposed to be "safe" and was sprayed on children at pools. After this went on for so long, the chemical was found to be very dangerous.
The American symbol, the Bald Eagle, was once threatened with extinction, due to the widespread and indiscriminate use of DDT, a very potent pesticide. DDT was spread over fields using crop dusters, and it drifted over lakes and streams. No thought to what damage it might cause.
DDT got into fish, and the fish got into the Bald Eagles. It caused the eggs of the eagles to become extremely thin, which caused the death of most of the chicks.
The use of DDT was finally stopped after the publication of a book called, "Silent Spring," by Rachel Carson. The book made the American people aware of what was happening, and public outcry caused the government to stop putting it everywhere, and to eventually ban it altogether.
It was DDT that kept bedbugs in check in America, however. Today we have an unstoppable explosion of bedbugs that we can't kill. Damned if you do, and damned if you don't...