Thanks for the link. All categories are, of course, vestiges of the Civil Rights Acts. Institutionalized racism. Hopefully, as we become a more blended society, most people just put "Two or More Races" or "Other".
Another fact is most of those "race" categories are primarilly cultural and little or nothing to do with genetics.
The 2020 census contains a new category for Middle East and North African (MENA). Although this category is largely Caucasian (like Hispanics) it makes the white (Caucasian) category look smaller than it actually is. Caucasians will still be a majority of the population in 2060. Not that it has any significance.