Which duty expected of citizens is the most important? why?

If we are talking in terms of America, then voting or following the law. This is because we have many privileges as Americans and following a few laws should be very simple with all the rights we have, and voting because voting in America shows that you're contributing to the country and helping your fellow Americans pick a new leader for our country.

I hope I could help!

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

The republican party