She's using picture books such as
The Upper Elementary teacher showed her students an amazing documentary called The Children's Marchwhich I highly recommend for older students.
Looking at the most recent Newbery honor books, this year's One Crazy Summerand last year's Claudette Colvin: Twice Toward Justicewould also be relevant this month.
There are so many wonderful resources out there! I love
and I would appreciate people writing in with other books and resources that they suggest.