The species was first protected in the United States and Canada by the 1918 Migratory Bird Treaty. The 1940 Bald Eagle Protection Act in the United States also tried to stop the killing of the bald eagle and the golden eagle. The bald eagle was an endangered species in 1967, and the penalties for people who killed the species grew more and more. Also, in 1972, DDT was banned in the United States. DDT was completely banned in Canada in 1989.