What is a concentration of a population of a city

Urbanization is defined in terms of importance of urban population while urban concentration is defined in terms of primacy (importance of the population living in the largest city).

I might be wrong tell me if I am

the safahids used force when persuasion to convert from being a sunni muslim to embrace shi'ism was not effective. they also persecute shi'ites who have different views from their imposed teachings.

a reason that was key to coolidge's victory in the 1924 presidental election was that; democratic party supporters were split in the north and south.