The failure of this crop in Ireland led to widespread famine during the mid-1800's:

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The failure of the potato crop in Ireland in the mid-1800s, due to a fungal disease commonly known as "potato blight," led to widespread famine that resulted in the deaths of approximately one million people and forced millions more to emigrate from Ireland. The potato was a staple food for many Irish peasants at the time, and the heavy reliance on this single crop made the population highly vulnerable to crop failures.

The Failure of This Crop in Ireland Led to Widespread