How many free states existed in 1850 ?

How has the caste system canged in indea and pacistane

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?

Which of these is not a criticism of the concentric zone model? it does not accurately describe cities after the rise of suburban development. it only applies to cities that grew after the development of the automobile. it assumes that inner-city areas will always be repurposed instead of abandoned. it places too much importance on the traditional central business district.