There is no reason to doubt that commercial enterprise has operated and kept pace with industrial activity in causing the growth of these urban centers. Figures for the trade of these sixteen Southern cities are not available. However, we have side lights upon the commercial life in the amount of railroad building that has taken place in the South since 1860. In 1860, there were only 8,317 miles of railroad in the thirteen states from Maryland and Delaware to Arkansas and Texas. In 1900, there were 46,735.86 miles in the same territory, an increase of 461.9 per cent. From 1900 to 1905 this increased to 55,239.22 miles or 18.2 per cent in the five years.[10] Likewise the traffic operations, including total tonnage, and freight, passenger, express and mail earnings of selected groups of railways covering most of this territory, increased very rapidly from 1890 to 1900. In the ten years, from 1890 to 1900, the tonnage increased from 63,597,120 tons to 121,180,317 tons or 90.5 per cent; and total earnings went from $113,616,184.45 in 1890 to $168,606,233 in 1900, an increase of 48.4 per cent in ten years. As these industrial and commercial forces affect the population, the Negro without doubt shares to a considerable extent the influence. That the Negro has been a large labor factor in the South is a patent fact. All the data available indicate that he has been affected by economic influences similar to those which have moved the white population toward the urban centers. The most decisive set of facts is the growth in the number of whites and Negroes in gainful occupations in Southern cities. The census returns of 1890 and 1900 for a number of Southern cities were sufficient for an inference. For some occupations figures for 1890 were not available, and in other occupations some cities were not reported in 1890. So a selected list of occupations was taken. The comparisons of those occupations selected are striking. Among the males, for domestic and personal service occupations, from 1890 to 1900, the white wage-earners increased 42.3 per cent and the Negro wage-earners increased 31.1 per cent. Here we see the influence of the growth of wealthy classes in the industrial and commercial centers, who require increasing numbers to supply their developing wants. In trade and transportation occupations, while the number of white wage-earners increased 25.2 per cent from 1890 to 1900, the Negro wage-earners increased 39.1 per cent during the same decade. For the same period, in manufacturing and mechanical pursuits, the white workers increased 6.1 per cent and the Negro workers increased 12.1 per cent. This indicates the dependence of the growing industry of the South upon its black male workers and shows how strong upon them is the economic pull.