Its also unusual for the plot of a children's book published in 1954 to end with a brown girl (albeit an aristocrat) marrying into a white anglophone royal fami

Its also unusual for the plot of a children's book published in 1954 to end with a brown girl (albeit an aristocrat) marrying into a white anglophone royal family - and earlier in the book a white English queen was considering marrying a brown prince. I wonder how that went down in, for example, the Southern states of the US at the time? Never read anything about reactions to the plot, but did it sell there? Did people let their kids read it?