In the U.S., the conditions for gentrification were generated by the economic transition from manufacturing to post-industrial service economies. The post-World War II economy experienced a service revolution, which created white-collar jobs and larger opportunities for women in the work force, as well as an expansion in the importance of centralized administrative and cooperate activities. This increased the demand for inner city residences, which were readily available cheaply after much of the movement towards central city abandonment of the 1950s. The coupling of these movements is what became the trigger for the expansive gentrification of U.S. cities, including Atlanta, Baltimore, Boston, Philadelphia, St. Louis, and Washington, D.C.