How did Hungary, one of the most powerful medi kingdoms, become such a small and weak country? Why is Hungary the only European country that lost more than half of its original territory?

匈牙利,中世紀最強大的王國之一,是如何變成如此弱小的國家的?為什么匈牙利是唯一一個失去了一半以上原有領土的歐洲國家?