1. Which statement explains how cattle kingdoms on the western frontier were most likely affected by the changes in railroad networks shown in Source 1? A. B. The expansion of railroad networks enabled ranchers to transport cattle to the East and expand into new markets. The development of railroad networks reduced the need for ranchers and farmers on the Great Plains. The expansion of railroad networks increased available land for cattle drives and the open range. The development of railroad networks started land disputes between cattle ranchers and farmers. C. D.