What were indigenous communities like before the Columbian Exchange?

The political cartoon below was created in the early 1900s which of the following action does this cartoon illustration

During the cold war, the united states was involved in certain regional conflicts due to fears later called the domino theory, which stated which concept?

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.