Question: In which U.S. state is Fort Knox located?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX dbp: <http://dbpedia.org/property/>
PREFIX res: <http://dbpedia.org/resource/>
SELECT DISTINCT ?uri
WHERE {
	res:Fort_Knox dbp:location ?uri .
        ?uri dbo:country res:United_States .
}