SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/country> <http://dbpedia.org/resource/United_States> . ?x <http://dbpedia.org/property/discipline> ?uri . }
Journals of how many fields can be found in US?
SELECT DISTINCT COUNT ( ?c ) WHERE { ?g property:discipline ?c . . ?g property:country resource:United_States }
538
There are [538] academic journals which are based in United States.
In the United States, there are [538] scientific journals.