What factors caused the low unemployment rate and the great growth in gnp from 1945 to 1960? how widespread was the prosperity?

This was brought by several factors such increased productivity and new developments in technology.  War bonds were earning and the fact that the U.S. economy remained intact and that it practiced rationing and saving of basic commodities helped boost its postwar development.  New jobs and high wages were plentiful and industries began to rise during this period.