1926. Gas is 17 a gallon. Haircuts are 25 cents. And U.S. Route 66--two thousand miles of road and concrete--connects Chicago with Los Angeles, making long-distance travel a reality for millions of Americans. Often called America's Main Street, this famous highway played a key role in the development of U.S. industry and commerce. It offered the prospect of a better life in the West for families trapped in rural poverty along its path...