Though not an expert, Spain has not been a happy country for many decades, Valencia has a tough time during the civil war. Franco supported by Hitler committed mass genocide in many cities towns and villages with neighbour fighting neighbour, tens of thousands disappeared after francos victory. Back to 2017 and many spanish still hold anger against the Republic. Spain is a house of cards, if catalonia succeeds the rest may not take much blowing.This must also be the EUs worst nightmare instead of growing the 1 state of europe, others may demand independence.