Why did slavery become an issue between Portugal and Kongo?

Who was in charge of american troops during world war i?

31/3: which equation has the solutions x =?

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.