The Irish Famine of 1845-52 was the greatest catastrophe in recorded Irish history. It was caused by the repeated failure of the potato crop, the main food source of the poorer classes. The failure resulted in hunger, starvation, and ultimately death or emigration for a quarter of the population - one million died and over a million emigrated. The emigrants formed the main basis for the Irish diaspora in Britain, the United States, Canada, and...