>>joshua+fh
I don't know what style guide ProPublica uses, but very recently AP decided to capitalize Black when used as a cultural term when it conveys "essential and shared sense of history, identity and community among people who identify as Black". They go on to say that they expect to make a decision soon about whether to do that with "white" as well.
https://blog.ap.org/announcements/the-decision-to-capitalize...
https://apnews.com/71386b46dbff8190e71493a763e8f45a