Most likely it was the Lumper -- what's a 'Lumbar' potato?
The most recent famine in Africa is the Horn Of Africa famine which was declared to be a famine by the United Nations in July of 2011.
Sudden climate change
The potato famine is the most commonly known and most likely the most recent of Irish history.
The Famine of stupid people posting on wikiAnswers
Most of the immigration was caused by the potato famine, but some were caused when their king had switched to a England church because of his marriage. That caused England to be in control of Ireland which left them weak. Another when the black plague had spread to them from England and the Irish were mad at them cause now, England had made most of their troubles.
Famine happens where ever human populations exceed the capacity of the land to support food. This can happen due to temporary conditions, such as unusual weather patterns. it can also happen due to climate change or drought. The African subcontinent and India are the most common famine areas.
The potato famine.
prince edward island is the most well known province of the BNA to have the potato famine but new brunswick, and Newfoundland also had the potato famine in the 1864.
colonial america
sub-saharan africa
Russet