Question: Which movies released in the United States does Zac Efron have leading roles in?
Answer(s):
answer: Charlie St. Cloud

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06wm0z)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06wm0z ns:film.actor.film ?y .
?y ns:film.performance.film ?x .
?x ns:film.film.runtime ?c .
?c ns:film.film_cut.film_release_region ns:m.09c7w0 . 
}