Question: List the state of the universities whose nation is United States ?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/country> <http://dbpedia.org/resource/United_States> . ?x <http://dbpedia.org/ontology/state> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/University>}