I sincerely hope that today (and obviously the day it actually happens) isn't something that I look back on with sadness in the future. I live in the UK, and am really saddened by the way that politics is 'progressing' - in fact, regressing to a time where nationalism seems to be the voice, and one which I think will inevitably lead to conflict. Combined with the Trump situation in the USA, I am extremely pessimistic…
It wasn't nationalism which caused conflicts in Europe, it was a lack of democracy.