#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

No statement uses or specializes migration; click here to add one.