At the same time, the railroad and trolley have abolished the isolation of the rural community and have made possible the diversion of local interests and loyalties to larger centers. Thus while communication aids the integration of the community it affords equal facilities for its disruption. Doubtless some of the smaller community centers will be unable to compete with the attraction of nearby larger centers, but there seems no good reason to believe that better communication will injure the best life of communities which are of sufficient size to support the institutions which will command local loyalty. This dual influence of means of communication on the internal and external relations of rural communities creates some of the chief problems of rural social organization, for the increase of means of communication in the past two or three generations has been more momentous and has had a more far-reaching effect on human relations than in all the previous centuries since the invention of writing. A brief survey of the more important of these new agencies will indicate how they affect the relations of the farmer to his community and to other communities. These may be considered under the two general heads of means of transportation, and means for the exchange of ideas. As long as transportation was by wagon and by boat, commerce was slow and expensive; each community was compelled to be largely self-dependent, and life was isolated to an extent that it is difficult for us to conceive. Anderson has well stated the situation when he says: "Merchandise and produce that could not stand a freight of fifteen dollars per ton could not be carried overland to a consumer one hundred and fifty miles from the point of production; as roads were, a distance of fifty miles from the market often made industrial independence expedient."[14] It was the steam railroad which made larger markets available, made possible the growth of our large cities and the opening up of new lands distant from markets. The railroad and manufacturing by power machinery put an end to the "age of homespun," and made it more profitable for the farmer to sell his products and to purchase his manufactured goods in exchange. The railroad, and the markets which it made available, changed the village center from a place of local barter to a shipping point and so tended to center the economic life of larger areas in the villages with railroad stations. Better local roads were necessary and business tended to become centralized in the village. The numerous wayside taverns along the main highways disappeared, as did the neighborhood mill and blacksmith shop. The railroad, more than any other one factor, has determined the location of our rural community centers.