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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the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.