They transported them west by the growing railroad
John Nance Garner was the president in 1935
Answer: There is pollution in the east river
Explanation: If we think about it cant be a lack of food as it talks about having a large food source. Nor can it be climate change as that would result in a low yellow Perch population. it cant be they aren't able to catch the bird. So the only logical answer is a pollution that the birds are adapted to.
Avoid forming political parts
#1: voter fraud
#2: They want their voices to be heard on the issues
Hope that helps ya!