imo, the Cosmopolitan Democracy model with the Continental Block approach would provide potentially an ultimate system to attain long-term world peace that would greatly save a lot of unneeded spending on government administration, security and military setup. Possibly an agile, financially viable, and politically stable system. The UN then would be converted to a UCB consisting of perhaps just (ideally) 4 sub-committees of which each is for a CB. Ideally, total 4 Continental Blocks: America/USA/Brazil/Mexico, Asia/China/Indonesia/Australia, Europe/Russia, Africa/Middle East/India. And Natural Borders for each Continental Block. The present form of UN managing and coordinating a total of 193 nations with different cultures, and political and economic structures individually would be hardly efficient or adequate, besides costly. When each CB required to manage and coordinate about 25 nations on average through trying to optimise (not maximise) their well-being and economic growth would be much more easier and effective. The conventional way for a strong nation trying to provide assistance and emergency care for a needed nation geographically 2 continents far away across ocean waters would be simply inefficient and ineffective. Initially, one CB in the 4 CBs might require more inter-CB helps in developing economic growth and stable security. lol https://www.pwc.com/gx/en/issues/economy/the-world-in-2050.html#keyprojections The World in 2050 The long view: how will the global economic order change by 2050?