Twaddle Raggy complete and utter twaddle - as usual

Prior to Henry II's incursion there was no "Irish Nation" as you fondly seem to think.

For vast tracts of the 700 years you mention the island was a united nation and existed in a state of peace and prosperity.

Various discontented elements in Ireland who sought advancement were cynically used by various foreign powers down through the course of those years to foment trouble in Ireland.

Meddling by the Roman Catholic Church in Ireland robbed people of opportunity.

"Sir Michael Hicks Beach, one of the pillars of the UK establishment, the sort of people who forced Ireland into poverty.
imo, the Irish had no choice"

Good heavens GSS how on earth did "he/they" manage to do that?