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That's a good question here is another one why do they keep identifying themselves as a minority by calling themselves black or African Americans ? Why don't they refer themselves as Americans of African decent? cut the B.S.
You could be zero percent like Rachel Dolezal. You could self-identify as black, and it would be your own business. All that applies unless you do as she did and make a living out of your being black, up to and including a high post at the NAACP, and get outed as a white impostor. Then the NAACP establishment will make the call that you were never black at all.
To be considered BLACK? You have to BE black. If you are not all black then you are partly black.
I'll make it easy on you.