So, WI from the start of Irish independance we have a united Ireland?
WI the British parliament in a fit of callousness decides to say 'screw you' to the unionists not just in the south but also in the OTL N.Ireland, the right decide its going to be more trouble than its worth whilst the left decides a united Ireland would be a good thing.
I'd think a full on civil war would start up pretty soon and given the wealth of N.Ireland it could be quite a nasty one...But then what? Independant N.Ireland? They're hardly going back to Britain afterall...