The valued ability to speak effectively and persuasively dates back to

The answer for this question is:  3200 B.C.E
During this period of time, Civilizations started to recognize organizational activities and the basic structure of Governance.
This condition make someone that has the ability to speak effectively and persuasively could get people to do his/her bidding and they could obtain power within a certain society.

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada

I'm going to go with 1,982 feet because of all of the ice.                                               ps its this is not the answer go with d 6,500.