George Sewall Boutwell, Reminiscences of Sixty Years in Public Affairs… (1902)
“ The fodder of the corn has now become valuable to farmers who produce milk for market, and already they are finding it profitable to raise corn, even when the price at the door does not exceed fifty cents per bushel. Coincident with these changes the States of the East have increased in population, and the proportion who live in cities is increasing at a greater ratio even. The railway system and the system of protection to American industry have been the chief instruments in the augmentation of population generally, and of the gains to cities. ”
