From how many different places did the weapons used in the American Indian wars originate?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/usedInWar> <http://dbpedia.org/resource/American_Indian_Wars> . ?x <http://dbpedia.org/property/origin> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Place>}
American_Indian_Wars