 However, another study by the Institute of Race and Poverty at the University of Minnesota Law show that after two decades of experience, most charter schools in the Twin Cities still underperform comparable traditional public schools and are highly segregated by race and income.To evade a shift to English, some Native American tribes have initiated language immersion schools for children, where a native Indian language is the medium of instruction.For example, the Cherokee Nation instigated a 10-year language preservation plan that involved growing new fluent speakers of the Cherokee language from childhood on up through school immersion programs as well as a collaborative community effort to continue to use the language at home.