One of the most important was climate changes. As climate changed, nomads had to find new places to migrate to which led to people going to areas that were uninhabited before. Another was the development of agriculture which more or less ended the nomadic way of life when people started settling.
Answer:
William Graham Sumner became a leading proponent of Social Darwinism, arguing that the wealthy were rich because of natural selection and argued that their wealth was a social service. Sumner argued that hereditary wealth allowed the fittest to pass on their virtues to children.
Explanation:
Because since these allows for a "division and labor", the answer would be "enough food" and "large population of non-farmers".
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Answer:
Determination and Hardwork?