One of the resolutions that I frequently make competitive high school debaters debate about is a proposal for the EU to federalize and form the united states of Europe. Honestly, the EU really should try this. African leaders are also trying to form a United States of Africa, and I wouldn't be surprised if something like it happens by the 2030s or 2040s...

https://en.m.wikipedia.org/wiki/United_States_of_Europe

https://en.m.wikipedia.org/wiki/United_States_of_Africa