The modern elected executive head of a state is just like a puppet because he has no kingly power. Even if he is enlightened like Maharaja Yudhisthira, he cannot do anything out of his own good will due to his constitutional position. Therefore, there are so many states over the earth quarreling because of ideological differences or other selfish motives. But a king like Maharaja Yudhisthira had no ideology of his own. He had but to follow the instructions of the infallible Lord and the Lord’s representative, an authorized agent like Bhismadeva. It is instructed in the sastras that one should follow the great authorities and the infallible Lord without any personal motive or manufactured ideology. Therefore, it was possible for Maharaja Yudhisthira to rule the whole world, including the seas, because the principles were infallible and universally applicable to everyone. The conception of one world state can only be fulfilled if we can follow the infallible authority. An imperfect human being cannot create an ideology acceptable to everyone. Only the perfect and infallible can create a program which is applicable at every place and can be followed by all in the world. It is the person who rules, and not the impersonal government. If the person is perfect, the government is perfect. If the person is a fool, the government is a fool’s paradise. That is the law of nature. There are so many stories of imperfect kings or executive heads. Therefore, the executive head must be a trained person like Maharaja Yudhisthira, and he must have the full autocratic power to rule over the world. The conception of a world state can take shape only under the regime of a perfect king like Maharaja Yudhisthira. The world was happy in those days because there were kings like Maharaja Yudhisthira to rule over the world.
From Srila Prabhupada’s purport to SB 1.10.3