There is nothing new about crossing racial boundaries

There is nothing new about crossing racial boundaries; what is new is the frequency of border crossings and boundary hoppings and the refusal to bow to the thorn-filled American concept, perhaps unknown outside the United States, that each person has a race but only one. Racial blending is undermining the master idea that race is an irreducible marker among diverse peoples—an idea in any case that always has been socially constructed and has no scientific validity. (In this century, revivals of purportedly scientifically provable racial categories have surfaced every generation or so. Ideas die hard, especially when they are socially and politically useful.) Twenty-five years ago, it would have been unthinkable for Time-Life to publish a computer-created chart of racial synthesizing; seventy-five years ago, an issue on “The New Face of America” might have put Time out of business for promoting racial impurity.

Gary B. Nash, “The Hidden History of Mestizo America,” The Journal of American History, Volume 82, Number 3 (December, 1995): 941-964.