It started. probably. when we began to use machinery extensively on the farm. The adoption of machinery required fewer hands. We added to It by our policies of reclamation and irrigation. Then the rest of the world took a hand. and particularly since we have restricted inimnigrafion. so that emigration from Europe must flow elsewhere. there has been a tremendous opening of new land to production in Australia. Canada. and the Argentine. and. of course. virgin soil and cheap labor can produce cheaper than we. Then came the war. and we speeded up everything in the United States to force production as a war measure.
Keywords matched
emigration