I think you can assume goodwill here. If OP is mistaken, clue them in. Reputable sources of info on the history of Catalonia are plentiful, whether online or in the library. In this case, OP is probably referring to the Spanish Civil War, which indeed happened within living memory and prior to which Catalonia was autonomous under the Second Spanish Republic:
https://en.wikipedia.org/wiki/History_of_Catalonia#Republic_...