Comment by etchalon

It's a replacement for the term "African American", which is the best way to think of it and why it's capitalized.

A good number of major publications have posted explanations for the editorial change:

https://apnews.com/article/entertainment-cultures-race-and-e...

https://www.cjr.org/analysis/capital-b-black-styleguide.php

https://www.nytimes.com/2020/07/05/insider/capitalized-black...