One feature common to most juvenile and young adult books, regardless of genre, is that most of the protagonists are Caucasian, an issue discussed at: http://www.washingtonpost.com/posteverything/wp/2014/12/08/characters-in-childrens-books-are-almost-always-white-and-its-a-big-problem/?utm_source=Publishers+Weekly&utm_campaign=216a5a2dae-UA-15906914-1&utm_medium=email&utm_term=0_0bb2959cbb-216a5a2dae-304873533
Picture books tend to be a bit more diverse, but not books for older kids. Here then are some historical book middle grade book suggestions that DON’T have white protagonists.
The Breadwinner & its sequels by Deborah Ellis (Taliban Take-Over era Afghani protagonist)
The Sound Of Propellers by Clive King (WW II East Indian protagonist)
White Jade Tiger by Julie Lawson (Time travel protagonist)