Europe and many other nations will look back on the early 21st century and wonder how they ever thought it was a good idea to willingly give up so much soverignity to foreign powers
Well the history is more complex than that - let's not rewrite it. The US bossed around and bullied large parts of Europe for decades (and still does). Often we did not have a choice (or, siding with the US was the least-bad option)
Europe was beaten down, broke and simply kaput.
Then it was split in a camp dependent on the US and a camp dependent on the USSR.
Both the US and USSR spent decades keeping us together but definitely not united.
This runs deep in European political culture.
Until 2 years ago many Dutch people had more in common and more trust in Americans than <insert European country>. If only because half of them go broke once every generation.