What would have happened if the British left Northern Ireland during the Troubles?

Aren't there some counties in Ulster that are Catholic-dominated? Those might belong to the PIRA.

Those will belong to the PIRA. Here's the oldest confessional map I could find. Given the Catholics' higher birth rate, I expect that their share was a bit smaller in the '70s and '80s, at the time of the POD.

Northern-irland-religions-1991.png
 
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