Do your own homework. This is about the 10 millionth question which you have posted about WW1, all of which are obviously relating to your "studies". Do a bit of reading and you may find the answer yourself.
The main assumption was that the mental capacity, self-discipline and initiative of schoolchildren would diminish to a lamentable level within a hundred years unless there were a strenuous effor to maintain an ordered, hierarchical monarchical system of government in all the main countries of Europe. It was thus the downfall of the Empires after WW1 that resulted in you asking this question.