SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/nationality> <http://dbpedia.org/resource/United_States> . ?x <http://dbpedia.org/ontology/knownFor> ?uri . }
What are some US citizens famous for?
SELECT DISTINCT ?h WHERE { ?w property:known_for ?h . . ?w property:nationality resource:United_States }
answer
The people whose nationality is United States are known for [answer].
People having nationality from the United States are known for [responding].