I see the future or perhaps the far future less as large groups of nation states but rather as a decentralized world power/government (UN with actual power) wit

I see the future or perhaps the far future less as large groups of nation states but rather as a decentralized world power/government (UN with actual power) with centralized city-states simply due to increased globalization (even if some are rejecting it as currently right now, its not like people can reverse globalization) meaning less importance of national powers, increased diversity/multi-ethnic populations/cultures gathering around large urban cities such as seen in Singapore and increased importance of global hubs being cities where the cities bring talent together instead of the countries themselves such as New York for Finance, Silicon Valley, etc. and also the massive powers of transnational corporate companies who hold sway due to their abilities to employ people, influence economies and make technological and societal change. Moreover, its not like you can really stop cities from gaining power, urbanization used to be and still is a symbol of development for most countries so its not like nation-states are against the idea of large cities. Nation-states aren't actively trying to decrease the size of cities and push people out of it simply because they would become too powerful. As well, nation-states will seek to only make certain cities powerful to be strategic instead of trying to make every city or location in the nation powerful which in turn brings to power powerful city-states. Its also stated that military occupation is a powerful deterrent for city-states taking over nation-states. I argue that simply starting a war decreases the importance of a city-state and you reach the stage where you scare away the talent and economical activity that gave meaning to the importance of a city-state simply by starting a war. There is not much economical and development going on when you are fighting or even threatening a war which would mean that you can not really take over a city-state without destroying it or basically have to pour money in to just resuscitate it, like in Syria or places in Middle East that are constantly threatened.