Based on an initial look through those articles and categories, it seems like the practice has been to build articles related to a topic like "Racism in [state or country]" and then create a category like "History of racism in [state or country]" for those articles to live in, rather than building a "Racism in X" article.
this article, in which someone describes "Portland's African-American culture -- a black culture distinct from ones found in the Bay Area and Chicago".
Based on an initial look through those articles and categories, it seems like the practice has been to build articles related to a topic like "Racism in [state or country]" and then create a category like "History of racism in [state or country]" for those articles to live in, rather than building a "Racism in X" article.
this article, in which someone describes "Portland's African-American culture -- a black culture distinct from ones found in the Bay Area and Chicago".