The blight that struck the Irish potato crop in the winter of 1845-46 brought ruin to tens of thousands of tenant farmers and laborers, reducing almost all of Ireland to poverty and, as a result, people had the choice of leaving Ireland or perishing. So, between 1846 and 1851, more than a million men, women and children emigrated to the United States and Canada, mostly through the port of New York. The information on these people exists in an invaluable...