It would be nice if you could choose to keep or replace your colour when forming new nations, I really like Savoy -> Sardina-Piedmont -> Italy, but Sardina's colour is gorgeous, I don't want to lose it when switching to Italy, but I'm 99% sure you can't go Italy then Savoy (I don't know if the mission update instantly when you switch or if at the end of the month, if it's at the end of the month you could go Italy->Sardina-Piedmont before the game knows you've switched).
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