https://www.nrpa.org/siteassets/nrpa...er-15-2021.pdf
Its there....
citizens/Americans: Use caution with this word. When we talk about parks and recreation serving communities, we are usually talking about how they serve all people whether or not they are a U.S. citizen. Referring to “residents” or “members” of a community is a more inclusive approach. Likewise, avoid using the term “Americans” generically for a group (because it limits the group to those who have citizenship status as Americans). (Sierra Club)Black, African American: The capitalized term Black is a recognition of how language evolves over time. The term reflects a shared identity and culture rather than a descriptor of skin color. African American (no hyphen) is a term used for people who share a lineage that can be traced directly or indirectly to Africa. African American is not necessarily interchangeable with Black. For example, people who live in America of Caribbean heritage may prefer Caribbean American. Always follow a person’s preference. Black can be used as an adjective in a racial, ethnic or cultural sense: Black people, Black culture, Black literature, Black studies, Black colleges. (Diversity Style Guide)Black should not be used as a singular noun. The term “white” should be lowercase.
I mean they are citing VOX and other places if that gives you any idea where its coming from.