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In page Education reform:

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States have tried to use state schools to increase state power, especially to make better soldiers and workers, and increase nationalism.[11] This strategy was first adopted to unify related linguistic groups in Europe, including France, Germany and Italy. Exact mechanisms are unclear, but it often fails in areas where populations are culturally segregated, as when the U.S. Indian school service failed to suppress Lakota and Navaho, or when a culture has widely respected autonomous cultural institutions, as when the Spanish failed to suppress Catalan.[citation needed]