how did the advent of potato change the conditions of poor in Europe
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Answer:
One of the most important crops brought to the Old World was the potato. Nunn and Qian (2010) claim it is the crop with the largest impact on the Old World. It is a tubular with enough vitamins to prevent scurvy and enough starch and water to eat as one's only food.
Highly nutritious potatoes also helped mitigate the effects of such diseases as scurvy, tuberculosis, measles and dysentery. The higher birth rates and lower mortality rates potatoes encouraged led to a tremendous population explosion wherever the potato traveled, particularly in Europe, the US and the British Empire.
They planted the tubers in trenches, gradually heaping on extra soil as they grew, to produce a high yield from small plots of land. When potatoes arrived in Europe, they quickly became the food of the poor. Unlike grain crops, potatoes can't easily be stored.