What challenges does Salva go through?

There are so many challenges that Salva goes through. He thinks his family is dead and has to run into the jungle when rebels attack. A lion eats his best friend. He must trek across the desert with little food or water. His uncle, who gets him through his harshest times, is tied to a tree and shot. Salva lives under harsh conditions at two refugee camps in Ethiopia. When Salva re-settles in America, he must learn a new language and adapt to a new culture.