Pushed off homeland a. Pulled to United States a. Once they decide to leave their homeland, they have a separate decision 3. We can see emergence of commercial agriculture at work in the onset of the first large wave immigrants to hit U.S. shores were the Irish, forced out of Ireland in 1840s under circumstances not dissimilar from ones faced by other immigrants from other parts of Europe later. Late 18th C. potato begins to be cultivated in Ireland on wide scale.
People find can grow very well with much better yield than earlier crops.
Great Hunger follows, mass starvation on nature as recently seen in Africa. Irish flee homeland in massive droves, for someplace can be fed, personal survival. Industrial revolution a. Industrial Revolution also limiting opportunities for skilled workers in European countries. Once again these are people who have been displaced 2. Jewish communities attacked by Russian cossacks, killing and destroying property.