There has been a big effort to protect the bald eagle! For example, in 1940 the Bald Eagle Protection Act was passed. That made it illegal to possess (without a permit), kill, harass, or sell bald eagles. Another thing that was killing many eagles was the use of the pesticide DDT. Luckily, it was banned by EPA in 1972.
https://www.msu.edu/~thelenam/actions.html
http://www.fws.gov/pacific/news/1999/beqanda.pdf
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