What is {population} of {Florida} that is {point in time} is {1940-0-0} ?
What was the population of Florida in 1940?
What is {population} of {Florida} where {point in time} is {1940-0-0} ?
SELECT ?d WHERE { resource:Florida property:population ?z . ?z property:point_in_time ?c . FILTER ( CONTAINS ( YEAR ( ?c ) , '1940' ) ) . ?z property:population ?d }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q812> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1082> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P585> <1940-0-0>
} 

SELECT ?obj WHERE { wd:Q812 p:P1082 ?s . ?s ps:P1082 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1940')) }