As part of its compliance with a state ban on ethnic studies, the
Tucson Unified School District has banned its Mexican American Studies program and a number of books including The Tempest by William Shakespeare and Rethinking Columbus: The Next 500 Years, which includes pieces by various Native American authors including Suzan Shown Harjo, Buffy Sainte-Marie, Joseph Bruchac, Leslie Marmon Silko and Winona LaDuke.