Question: Who is the participant on the event of 1945-9-2?
Paraphrase: Who is the member on the occasion of 1945-9-2?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q6538 wdt:P607 ?answer . ?answer wdt:P582 ?x FILTER(contains(YEAR(?x),'1945'))}
Answer: World War II