Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.eyewitnesstohistory.com/irishfamine.htm
Description:
At first, the potato seemed heaven-sent. It thrived in the damp Irish climate, was easy to grow and produced a high yield per acre. In the period from 1780 to 1845 it helped double the Irish population from 4 to 8 million. However, with this population explosion came an increased demand for land. The only solution was to divide the available parcels into ever smaller plots for each succeeding generation. Soon, the diminished size of these plots dictated the planting of potatoes as it was the only crop that could produce a sufficient yield of food on such limited acreage. By 1840, fully 1/3 of Ireland's population was totally dependent on the potato for its nourishment. It was a dependency that teetered on the brink of starvation and created a time bomb that needed only the slightest spark to explode.