collective memory

noun
1.
a memory or memories shared or recollected by a group, as a community or culture.
2.
any collection of memories passed from one generation to the next.
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World English Dictionary
collective memory
 
n
the shared memories of a group, family, race, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
But each time it rumbles, it sends a shudder through the local collective
  memory.
We will be allowed to catch a glimpse of a forgotten world, which has
  disappeared from humanity's collective memory.
The faster the world changes, the more important it becomes for firms to stem
  collective memory loss.
It was in conflict with the collective memory of the nation.
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