Here, set against an endless stretch of windswept plains and tufts of cottonwoods, instructors are using a state-approved curriculum to teach students exclusively in Arapaho. All costs related to the school, which has an operating budget of $340,000 a year, are paid for by the tribe and private donors. Administrators plan to add a grade each year until it comprises pre-kindergarten through 12th-grade classes.
“Language-immersion schools offer an environment that goes beyond teaching the language,” Ms. Slaughter said. “It provides a safe place where a child’s roots are nurtured, its culture honored, and its being valued.”