In the mid-1870s, state Granges in the Midwest were successful in passing state laws that regulated the rates they could be charged by railroads and grain warehouses. The birth of the federal government's Cooperative Extension Service, Rural Free Delivery, and the Farm Credit System were largely due to Grange lobbying. The peak of their political power was marked by their success in "Munn v. Illinois", which held that the grain warehouses were a "private utility in the public interest," and therefore could be regulated by public law (see references below, "The Granger Movement"). During the Progressive Era (1890s–1920s), political parties took up Grange causes. Consequently, local Granges focused more on community service, although the State and National Granges remain a political force.