WASHINGTON — President Joe Biden on Friday nominated federal appeals court Judge Ketanji Brown Jackson to the Supreme Court, making her the first Black woman selected to serve on a court that once declared her race unworthy of citizenship and endorsed segregation.As he introduced Brown Jackson, Biden called her a “proven consensus builder” who has “a pragmatic understanding that the law must work for the American people.”“She strives to be fair, to get it right, to do justice,” the …