But economic and social changes were taking place which gave the darkening cloud a silver lining. On an irregular but narrow belt of land stretching from southeastern Maine to the Chesapeake Bay manufacturing establishments had been erected, towns and cities had sprung into existence as if by magic, and migration from the poor farms and the hard conditions of New England country life was also turning to the mill centers, and thus giving promise of a new East, whose life should be industrial and urban like that of smoky, grimy Lancashire, England. The older commercial and seafaring interests, which had given the Federalists their power and made the American flag known on every sea, were now giving way to the vigorous young captains of industry whose mills at Lowell, Providence, New Haven, New York, Philadelphia, and Baltimore gave employment to thousands of people. Much of the money which had made the New Englanders go down to the sea in ships was now invested in manufactures. The woolen mills of the East produced in 1820 a little more than $4,000,000 worth of cloth, the cotton mills, $4,834,000; but in 1830 the yearly manufactures of wool, cotton, and iron were estimated by the Government as worth $58,500,000. Yet the total investment in these enterprises was not much in excess of $100,000,000. In Massachusetts, Connecticut, New York, and Pennsylvania the growth had been miraculous, and the profits were enormous, if we except one or two years for the woolen interests. So that while the total annual crop value of Southern plantations amounted to $40,000,000, and the _per capita_ wealth of the white people of the so-called black belt was very large, the returns from three industries located in a much narrower industrial belt of the East were more than a third greater. The taxable value of the slaves who produced most of the cotton and tobacco was not less than $1,000,000,000; the total investments of the East in manufactures of all kinds was certainly not more than a fourth as great as that in slaves. And what made this development the more significant was the fact that nearly all that the black belt produced was sold in Europe, while nearly all that the industrial belt produced was sold to the people of the United States, mostly to States which were not engaged in manufacturing at all.