If Obama was hailed as our first black president, why isn't Meghan Markle being acclaimed as Britain's first black princess-in-waiting?

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Or whatever the Brits call the wife of a junior member in the Royal line. Obama had a white mother, black father, while Markle has a white father and a black mother. Is there a difference? If so, why?

I'm not raising this question out of any kind of racism, but rather a matter of curiosity.

 Admittedly, she wasn't born in kenya, but ....

Admittedly, she wasn't born in kenya, but ....