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,中世纪最强大的王国之一,是如何变成如此弱小的国家的?为什么匈牙利是唯一一个失去了一半以上原有领土的欧洲国家?