We were half-castes in the U.K. until 2001 (2001!), when the census officially deemed us “mixed.” In US, census allowed choice of only one race until 2000!
Change only really began in the wake of Loving v. Virginia, the 1967 Supreme Court case that officially legalized interracial marriage.
The Loving decision overturned a trial judge’s opinion, written in 1958, that “Almighty God created the races white, black, yellow, malay and red, and he placed them on separate continents. And, but for the interference with his arrangement, there would be no cause for such marriage. The fact that he separated the races shows that he did not intend for the races to mix.”