Where are ethnic group located which speak Nebraskan?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Nebraska> <http://dbpedia.org/ontology/language> ?x . ?x <http://dbpedia.org/property/region> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/EthnicGroup>}
Nebraska