The first astronomer to state the fundamental laws of planetary motion, Kelper was also known for his works in geometry, optics and philosophy.
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Arguably the most profound effect of World War I on African Americans was the acceleration of the multi-decade mass movement of black, southern rural farm laborers northward and westward to cities in search of higher wages in industrial jobs and better social and political opportunities.
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The Department of War was one of the first executive branch departments in the u.s. government.
