How did the war change relationships between imperial powers and colonies

The First World War saw the colonial empires of France and Britain mobilised to aid European and imperial war efforts. This mobilisation and the difficulties of demobilisation placed considerable strain on imperial systems which were only partly addressed through post-war reforms. The Great War also unleashed an unprecedented ideological challenge to colonial rule embodied in the ideas of Woodrow Wilson which took form through the mandatory system. Although there were some restrictions placed on the activities of the colonial powers, both Britain and France maintained their imperial rule, often violently suppressing anti-colonial nationalist challenges.

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"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.