I never understood the american obsession with race (well, and sexuality). I live in a small EU country on the edge of the balkans... what the hell should I write if I wanted to get hired? I'm white... everyone here is white... but just by living here, I might have a more "diverse" worldview (compared to a white american is massachussets, with enouh knowledge and money to attend MIT) than someone of a different race…
It’s not unique to America but it is a major differentiator from other countries.
A key thing to note is that many homogeneous countries are extremely racist but don’t notice it because it doesn’t hugely impact day to day life. A mot-so-malicious example of this is that when my brother went to Korea to teach English, the parents wanted him (a white man) instead of the Asian American who was born in America and also going to the same Ivy League school. Obviously there are much less fun examples of racism but that one was… interesting. In the US that level of open racial preference would have been considered socially unacceptable, especially among the upper middle class college set.