I venture the assertion that without these two factors American commercial agriculture. if figured on a legitimate business basis. would never have returned a profit. To cap the climax. on the one hand. American agriculture became more efficient than ever. and. on the other. the world market bid fair to disappear. Mechanization of agriculture and the application of science to crops. soils. and farm animals made possible a greater farm production than ever before. The slowing of population growth. the restriction of immigration. and important dietary changes restricted the domestic market. The expansion of agriculture into the fertile. virgin regions of Canada. Russia.
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immigration