Raymond Pearl. specialist in vital statistics at Johns Hopkins University. in an article on " World overcrowding." estimates a population of about 150.000.000 in continental United States in 1950. Over the 1920 census. this is an increase of nearly 45.000.000. The Census Bureau estimates a population of 120.000.000 in 1930. about 15.000.000 over the population of 1920. To provide food for the normal increase in our population. not counting immigration. the Secretary of Agriculture estimated that it would be necessary to bring under cultivation 8.000.000 acres per year. or approximately 240.000.000 acres between now and 1950 (Yearbook of 1921). This partly answers the gentlemans question.
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immigration