Why are the human societies being complex and diversifie?

the evolution of complex societies can be attributed to several factors the prevalence Fury which explains the start of complex societies is the pressure excluded by welfare or a method to organise a population of approximately 30 more than 150

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early settlements on the subcontinent. both the indus and the ganges rivers carried rich silt from the mountains to the plains. when the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.