What is {instance of} of {West Germany} that is {end time} is {1990-10-2} ?
On 1990-10-2, why did West Germany fall?
What event caused the end of West Germany as of 1990-10-2?
SELECT ?y WHERE { FILTER ( CONTAINS ( YEAR ( ?s ) , '1990' ) ) . ?k property:end_time ?s . ?k rdf:type ?y . resource:West_Germany rdf:type ?k }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q713750> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P31> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P582> <1990-10-2>
} 

SELECT ?obj WHERE { wd:Q713750 p:P31 ?s . ?s ps:P31 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1990')) }