How does the author support his point that comparing blacks and hispanics is "to construct a fallacious equation"

 The author argues that race mixture “has not been a point of pride in America”, it is easier to talk about diversity that take an action on the subject. he says that America is a “mestizaje society” because of the influence of mexican, now called Hispanic. He sustains that this comparison between blacks and Hispanics is nonsense because there is no Hispanic race so to compare them is a “fallacious equation”

According to a gossip website they are around 40 .. i hope it's not a question from your book!