There could be a number of reasons for that, many of which could be grouped together as "they don't want to be identified."
I think I found the wiki article Predditors would use (this one is per household, there is another page for per capita under See Also). The data apparently came from the US census and the "American Community Survey." As you mention, there's no subgroup breakdown for black or white ethnicities. There is a "detailed ancestry" section, but it discloses some problems with that data. Israel comes up 35th in that list.
There could be a number of reasons for that, many of which could be grouped together as "they don't want to be identified."
I think I found the wiki article Predditors would use (this one is per household, there is another page for per capita under See Also). The data apparently came from the US census and the "American Community Survey." As you mention, there's no subgroup breakdown for black or white ethnicities. There is a "detailed ancestry" section, but it discloses some problems with that data. Israel comes up 35th in that list.