1900 - Ireland was by far one of the poorest countries in Europe and Dublin was one of the largest slums in Europe.You have, unsurprisingly completely failed to grasp, and therefore respond to the point he made, which is hardy a surprise.
He pointed out that almost immediately Irelands hard fought independence was won, Ireland had a large & steady trail of immigration (mostly too Britain) that continues right up until this very day.
Most of it down to the policies of successive Irish governments, starting with those of De Valera.
Quite why you imagine your link mitigates that I don't know - but pretending it never happened is deluded.
2017 - Ireland is one of the most stable democracies and one of the most successful and wealthiest countries in the world.