Did {Atomic_bombings_of_Hiroshima_and_Nagasaki} {participant} {United States of America}?
Was the USA involved in the atomic bombing of Hiroshima and Nagasaki?
Was United States of America participant of Atomic bombings of Hiroshima and Nagasaki?
ASK WHERE { resource:atomic_bombings_of_Hiroshima_and_Nagasaki property:participant resource:United_States_of_America }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q488> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P710> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q30>. } 
ASK WHERE { wd:Q488 wdt:P710 wd:Q30 }