I still don't get how a entire nation can starve to death, from a lack of potatos....
One word: the British

There was plenty of food in Ireland. The British owned it all. Potatoes are easy to grow, and thusly are cheap, so they were the only thing Irish people could afford (because Irish = poor, British = rich).
When the potatoe blight spread, the irish lost their only source of food, and so they all starved to death. And the British just sat back and laughed and drew cartoons of emaciated irish people.
And so we hate them.

Simple
