When you think of castes, India's strict caste system likely comes to mind. In Caste, Wilkerson argues that America has its own hidden caste system, a hierarchy that has influenced the United States both historically and currently. On top of race and class, Wilkerson points out that our understanding of caste systems must also change if we are to better ourselves as a nation.

I'm not at all surprised Caste has spent almost a year on the New York Times nonfiction bestseller list. Wilkerson does an excellent job methodically breaking down how caste systems work and why the United States perfectly fits the criteria. Comparing and contrasting the US to India and Nazi Germany, Wilkerson will give you plenty to think about in her eye-opening book.