Article: 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. This plan was part of an ambitious goal that in 50 years, 80% or more of the Cherokee people will be fluent in the language. The Cherokee Preservation Foundation has invested $3 million into opening schools, training teachers, and developing curricula for language education, as well as initiating community gatherings where the language can be actively used. There is a Cherokee language immersion school in Tahlequah, Oklahoma that educates students from pre-school through eighth grade. Graduates are fluent speakers of the language. Several universities offer Cherokee as a second language, including the University of Oklahoma and Northeastern State University.

Now answer this question: Which Native American group is involved in a language preservation project?
Cherokee Nation