I got this one from the Mad Revisionist.
The Irish Diaspora led to an Irish presence over the world, and they
achieved prominence and influence in the countries that became second
home to them (e.g. Bernardo O'Higgings, the Founder of Chilean
Independence). In the United States they took control of the police
and political machines.
What if the Irish were seen as Jews were? What if there were muttering
about an "Irish conspiracy" to rule the world? What if there were
warnings about "Hibernism"
But, Callisto, there was! Haven't you seen the "no Irish need apply" signs for employment and lodging applications from the nineteenth century? And, as late as the nineteen thirties, George Orwell comments on similarities between the "Irish Jokes" and the "Jewish Jokes" in England. What saved the Irish from the extreme extent of antisemitism was simply the fact that the Irish "diaspora" was rather localized and concentrated -- primarily in Ireland, and New England. There, the Irish were so numerous that they simply couldn't be ignored, or repressed, beyond a certain point.
In contrast, there was no location where Jews made up more than about 10% of the population, and, usually, rather less. So, they were ready, and vulnerable targets for harassment. Might makes right, you know.
Irish were protected from that sort of reaction by belonging to the
Catholic Church, which had adherentes in their host countres, so there
was no religious problem to speak of.
But what if the Irish had held to their brand of Christiantiy and
rejected all attempts to Romanize them. They would still have been
persecuted for their faith, an found Protestants to be as intolerant
as Catholics. They would have dispersed, as in OT, but would have been
less welcome in their adopted countires, though accepted because of
their value as soldiers.
On the other hand, Jews decide that they are actually Protestant...
so the situation between Jews and Irish is reversed.