Slavery was the most significant cause of the controversy
The correct answer of this question is letter D option. African colonies of France and Britain joined the war effort on the side of the Allies because they thought it would bring them independence after the war. After the war, Roosevelt brought up the independence of the African colonies. Then democratic government was introduced to the colonies.
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Credit for our modern version of the school system usually goes to Horace Mann. When he became Secretary of Education in Massachusetts in 1837, he set forth his vision for a system of professional teachers who would teach students an organized curriculum of basic content.
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