Actually, #1 was indeed a great trouble, Phil. Or rather, its' failure as Ireland's staple crop in the early 1800s was, leading to mass starvation and the slow death of over a third of the Irish people, while the English did little to alleviate the appalling suffering.
Out of such woe came the emigration of survivors to the New World, which has given rise to the annual raucousness which is St Patrick's Day, celebrated by thousands of 'Kelly green'-clad Americans, over a third of whose bellies are bulging like overladen barges, thanks to the overconsumption of ... French fries.
Funny Old, and New, World, innit?