It's not the first. It's not even the first in Europe: the first was the UK, Belgium and Switzerland came after. There are and have been others around the world throughout history too: the CSA, the first USA, the USSR, the UAE, and the Arab League (just to name a few).
Most systems like the EU don't work well after a certain size. I don't know if we can say whether the EU has reached the point where it's unworkable yet.
Most systems like the EU don't work well after a certain size. I don't know if we can say whether the EU has reached the point where it's unworkable yet.