Naacp and unia views on american society

Which of the following descriptions is an example of the curtual diffusion

What was the historic border between the united states and mexico?

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.