I want to know the answer to the following question:
What law passed in 1940 regarding the population of the U.S. national bird?
All the background I'm provided with is that "Other legislation followed, including the Migratory Bird Conservation Act of 1929, a 1937 treaty prohibiting the hunting of right and gray whales, and the Bald Eagle Protection Act of 1940.". Is that enough to answer the question?