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a type of mathematics that relates points, lines, surfaces, and angles to each other

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization

the four most common systems of greek government were: democracy - rule by the people (male citizens). monarchy - rule by an individual who had inherited his role. oligarchy - rule by a select group of individuals.