Did {Ernest_Hemingway} {country of citizenship} {United States of America}?
Did Ernest Hemingway hold US citizenship?
Was Ernest Hemingway a US citizen?
ASK WHERE { resource:Ernest_Hemingway 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/Q23434> . ?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:Q23434 wdt:P27 wd:Q30 }