Why where the articles of confederation replaced with the constitution?

Which of the following is an effect that constantine's conversion to christianity had on the roman empire?

Who was the redcoat leader (major john pitcairn,militias, ralph waldo emerson, concord, captain john parker)

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.