Earlier quoted context omitted.
I wouldn't describe integrating further to the point of becoming more like the US as "unstable". And that's the most likely outcome, which should make the EU more trustworthy as a partner, not less. EDIT: by "like the US" I mean federalization. This video explains it well: https://www.youtube.com/watch?v=HnarX3HPruA
I would argue that not only is it not the most likely outcome, but that it's practically impossible. When the colonies united they all spoke the same language and shared the same culture as the descendants of recent British colonists. Furthermore, they had just fought and won a war of independence together. The first presidential election was unanimous with every single electoral vote backing George Washington. Do yo…
Also, I was surprised to learn how heterogenous the different regions of the US were from the very beginning, in origin, character and motivations. The Puritans, Quakers, Cavaliers, French nobles and traders etc.
This video explains why it's very likely to happen: https://www.youtube.com/watch?v=7yHJehbWiNo