Question: Which is the historical country that had Romanian as official language?
Paraphrase: Which is the authentic nation that had Romanian as official dialect?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P37 wd:Q7913 . ?sbj wdt:P31 wd:Q3024240 } 
Answer: Kingdom of Romania, Principality of Wallachia, Principality of Transylvania, United Principalities, Moldavian Democratic Republic, Principality of Moldavia, Kingdom of Romania under Fascism