For the most part, the decision to try a child (age 13 - 17) as an adult is MOSTLY based upon the severity of the crime. A good example of this would be the "Seven Delinquent Behaviors." Those are crime so heinous that when a child commits them they are to be tried in adult court, not Juvenile Court.
The major Allied powers in World War I were Great Britain (and the British Empire), France, and the Russian Empire, formally linked by the Treaty of London of September 5, 1914.