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Shudras was the lowest cast system.
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The Universal Declaration of Human Rights, is a non-binding declaration adopted by the United Nations General Assembly in 1948, somewhat in response to the barbarism of World War II.
The "Out of Arfica" theory proposes that the humans originated in Africa and spread from there to other continents. The main parts of human evolution would then have happened in Africa according to this theory. More specific theories propose East Africa for this .