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What is the MOST likely reason the districts are separated from one another?
Each district has citizens that are specially qualified to provide a certain export to Panem.
The districts are each geographically isolated and it is very expensive to travel between them.
The districts blame each other for the existence of the Hunger Games and have chosen to keep to themselves.
Keeping individual districts isolated makes them less likely to be able to join forces against the Capitol.
Citizens are struggling to survive and do not have time to travel throughout the districts.