While there are many different occasions that you could be refering to, if you are refering to the beginning of the novel, and the dinner that Nick has with Tom and Daisy and Jordan, the issue that Tom raises is a book called, "The rise of the Colored Empires" by Goddard. Tom tells Nick that he agrees with the author, and that it's "scientific" that the white race is in danger of being overwhelmed by Blacks.
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