(i) During the war, industries were restructured to produce war-related goods. Entire societies were also reorganised for war — as men went to battle, women stepped in to undertake jobs that earlier only men were expected to do. (ii) Most of the killed and maimed were men of working age. With fewer members within the family, household incomes declined after the war. (iii) Economic powers like Britain and France declined after the war. The war transformed the U.S. from being an international debtor to an international creditor. (iv) The war had led to an economic boom, that is, to a large increase in demand, production and employment. When the war boom ended, production contracted and unemployment increased.