This conflict is External because, Salva needs to run away to the bush from the Goverment trying to make Sudan a only muslims country. Salva is facing a Man vs Society type of conflict, or Salva vs The Goverment.
This conflict is internal because Uncle has died in front of salva's eyes and that makes him suffer the hurt he is having inside because Uncle was the only one Salva had in his travels, but he got killed by the Nuer tribes.
This Conflict is Internal because Salva was left all alone and has to survive on his own, that could be challanging for a 11-year old like him. Salva need's to be prepared for anything since he's alone and he need's to fight his fear of dying.