Did {Thomas_Edison} {country of citizenship} {United States of America}?
What country was Thomas Edison a citizen of?
Was Thomas Edison a citizen of the United States of America?
ASK WHERE { resource:Thomas_Alva_Edison property:country_of_citizenship resource:United_States_of_America }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q8743> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P27> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q30>. } 
ASK WHERE { wd:Q8743 wdt:P27 wd:Q30 }