Again, a matter of 'ethnicity' as opposed to 'race'. The Americas are fairly high compared to the rest of the world on the latter, but are absolutely stomped on the former by any large African or Asian nation.
Even this isn't really a guarantee, because outside of Hispanics (which is a vague "you have ancestry from somewhere where people speak Spanish") the US doesn't track ethnicity.
Iranians, New York Jews, Southern WASPs, Italians, and Russians fresh off the boat are all lumped in as "white people" for census reasons.
African Americans descended from slaves, those that immigrated from the carribean, Afro Brazilians and Nigerians are all just "black people."
Pakistanis, people from India, Chinese, Koreans, Hawaiians and other Pacific Islanders are all just "Asian."
Any reasonably large city can have you navigating through dozens of different ethnic groups on a given day, but there's no way to actually know this since the US doesn't track this data in any meaningful sense.
Confusing the issue there's been a tendency for certain Hispanics to begin self identifying as "white people" making the country look less diverse than it actually is.