Looking to this crucial period of life, childhood, the Messenger of Allah -prayers and peace of Allah be upon him- had drawn for it a scientific and educational course of conduct.
In the year 1924, the Islamic Khilafah became abolished. That was the Ottoman empire, which ruled for almost 500 years. Before them you had other Khilafahs that ruled the entire Muslim Ummah. This was a continuation of the Khilafah after the death of the Prophet Sallallahu 'alyhi wa sallam.