Irreversibility refers to the preoperational child's tendency to

A child's tendency to have the belief that things that have been done are unable to be undone. The child also will have the inability to think backwards in order to imagine the conclusion, then mentally assess the events in reverse order to the starting point of the occurrence

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Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.