How many games have a publisher based in US?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/location> <http://dbpedia.org/resource/United_States> . ?uri <http://dbpedia.org/ontology/publisher> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/VideoGame>}
United_States