Question: What bordering country of the US that once had the smallest population?
Answer(s):
answer: Canada

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.09c7w0)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.09c7w0 ns:location.location.adjoin_s ?y .
?y ns:location.adjoining_relationship.adjoins ?x .
?x ns:common.topic.notable_types ns:m.01mp .
?x ns:location.statistical_region.population ?c .
?c ns:measurement_unit.dated_integer.number ?num .
}
ORDER BY xsd:integer(?num) LIMIT 1