I always understood the term 'black' (or 'Black', if you write for The Guardian) to refer to sub-Saharan Africans or people of sub-Saharan African origin.
But, perhaps in a rush to embrace victimhood, more and more people are today are using the term black to refer to other people.
So, apparently Barack Obama is black - 'the first black President of the United States'.
And Lewis Hamilton is supposedly the only black driver in Formula One.
And Jordan Peele is a black film director, apparently.
And then there's Meghan Markle.
There may also be people of Pakistani heritage who refer to themselves as black.
And, sorry to say, it's all a load of bullsh*t.
Barack Obama, Lewis Hamilton, Jordan Peel, Halle Berry and Meghan Markle are all biracial (mixed-race). They're not black. Disregarding the other half of their ethnic heritage is intellectually dishonest.
^^^ This is a black person.
^^^ And this is a biracial person, half white and half black.
Not difficult, is it?