#migration  the movement of a group of people from one country or locality to another
  supertype:  #group_action__groupaction  action taken by a group of people
  subtype:  #emigration__out-migration__outmigration  migration into a place
  subtype:  #immigration__in-migration  migration out of a place
  subtype:  #gold_rush  a large migration of people to a newly discovered gold field

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