Ah. So, the map isn't technically fully accurate, and if it distinguished between white and biracial, white would be far smaller?
If we looked at "biracial" as a seperate category, whites would not be a majority in
any province (except maybe the Netherlands, and the North Spanish provinces...), considering they're all basically fresh immigrants from Europe; it becomes almost inevitable that you're going to marry into a biracial family, as Georgia lacks the "blacks are lesser than us" feeling that OTL had. Hence why "white" applies to most of everyone except for tribals/completely monoracial Africans. The term should be revised, but that's what it is thus far on the census.
All the founding families (Jefferson, Adams, Burr, Arnold, etc.) are all biracial families now, and then major families such as Taylor, Goering, Pierce, etc. are all mixed race as well.
"Blacks", as on the map, are basically the tribal Africans that haven't married into any non-black families.