After the war, Kansas was home to frontier towns; their railroads were destinations for cattle drives from Texas. With the railroads came heavy immigration from the East, from Germany as well as some freedmen called "Exodusters". Farmers first tried to replicate Eastern patterns and grow corn and raise pigs, but they failed because of shortages of rainfall. The solution, as James Malin showed, was to switch to soft spring wheat and later to hard winter wheat. The wheat was exported to Europe and was subject to wide variations in price. Many frustrated farmers joined the Populist movement around 1890, but conservative townspeople finally prevailed politically. They supported the progressive movement down to about 1940, but isolationism in foreign affairs combined with prosperity for the farmers and townsfolk made the state a center of conservative support for the Republican Party since 1940. Since 1945 the farm population has sharply declined and manufacturing has become more important, typified by the aircraft industry of Wichita.