That's because we wisely drove out the Irish after they tried to swarm our nation and declare the areas they infested as historical Ireland. They claimed it was taken from the original (racially pure) Irish by the English by force of arms and that they were there to reclaim the land for true Irishmen. And they drunkenly swarmed the streets waving Irish flags and shouting, "Yes, we can! (Hic!)". And left empty whisky bottles and Harp lager bottles everywhere at the rally site.
‘Twas glorious was it not!