What environmental and technological factors led spain and portugal to explore new trade routes in the atlantic?

The united states government was in debt from its beginning. how did the u. s. get into debt, and whom did it owe money?

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.

Which piece of information would most a historian create an interpretation of this photograph of works in a factory?