The worldwide Great Depression of the early 1930s was a social and economic shock that left millions of Canadians unemployed, hungry and often homeless. Few countries were affected as severely as Canada during what became known as the "Dirty Thirties," due to Canada's heavy dependence on raw material and farm exports, combined with a crippling Prairies drought known as the Dust Bowl. Widespread losses of jobs and savings ultimately transformed the country by triggering the birth of social welfare, a variety of populist political movements, and a more activist role for government in the economy.