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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.
In 1930-1931 the Canadian government responded to the Great Depression by applying severe restrictions to entry into Canada. New rules limited immigration to British and American subjects or agriculturalists with money, certain classes of workers, and immediate family of the Canadian residents. A large number of unemployed immigrants were also deported.