And when does that happen ?
1870s?
I've had it happen as early as the (late) 1850s.
It can be a long waiting game for the rebels. You'll want to make sure your prestige is greater than Sardinia-Piedmont's, otherwise the Redshirts may join them instead of you. You'll have the chance to refuse unification, but then you'll be playing Sicily and the rest of Italy will unite under S-P.
F11: ScreenshotI will post the screenie tonight ...
by the way any special key for the screenshot in Vicky2 ?
Whether or not your prestige is higher they could still join S-P; S-P always has a shot with the Redshirts; anyone else has to be a GP.