Did {Willie_Nelson} {ethnic group} {Choctaw}?
Did Willie Nelson belong to the ethnic group of Choctaw?
Was Willie Nelson part of the ethnic group Choctaw?
ASK WHERE { resource:Willie_Nelson property:ethnic_group resource:Choctaw }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q206112> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P172> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q324516>. } 
ASK WHERE { wd:Q206112 wdt:P172 wd:Q324516 }