During the mid-1950s and 1960s, St. Louis and Kansas City suffered deindustrialization and loss of jobs in railroads and manufacturing, as did other Midwestern industrial cities. In 1956 St. Charles claims to be the site of the first interstate highway project. Such highway construction made it easy for middle-class residents to leave the city for newer housing developed in the suburbs, often former farmland where land was available at lower prices. These major cities have gone through decades of readjustment to develop different economies and adjust to demographic changes. Suburban areas have developed separate job markets, both in knowledge industries and services, such as major retail malls.