Eight states—Arizona, Idaho, Louisiana, North Dakota, South Carolina, Tennessee, Utah, and Wisconsin—passed laws in 2015 that require students to pass some version of the test given to immigrants applying to become naturalized U.S. citizens in order to graduate from high school, according to a recent article in The New Yorker.

And the Joe Foss Institute, the Arizona nonprofit that has led the effort to pass such laws, plans to lobby to bring that requirement to every state by 2017.