We often modify our long-term memories in light of our current knowledge and expectations. this best illustrates the impact of

this best illustrates the impact of: Reconsolidation
Reconsolidaiton refers to the reactivation of memory due to some modification in memory trace.
This process allows our memory to resurface if we're exposed to a specific trigger that is correlated to that specific memory

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.