In chapter one of Lord of the Flies, we learn that children are stranded on an island as a result of a plane crash. Piggy and Ralph meet first, then they call a meeting by using a conch shell to summon anyone else on the island. They meet a boy named Jack, who has put himself in charge of his choir.
USA stands for United States of America. I am not so sure if that was what your were asking or not.
The supply were the hufflepuff trees and the demand were the peoples wanting for the trees