Only in art and lore was Rome suddenly sacked by barbarians who appeared out of nowhere

The failure to control migration has brought down empires before. Only in art and lore was Rome suddenly sacked by barbarians who appeared out of nowhere. 

In reality, climate change and turmoil in central Asia — sound familiar? — caused wave after wave of mass migration, of Vandals, Visigoths, Ostrogoths, Alans and others. 

These were people who wanted to settle peacefully inside the Empire. Unable either to keep them out or to integrate them, the Western Roman Empire as an entity gradually atrophied and eventually collapsed.

The EU needn’t end the same way. But it could. 

https://www.bloomberg.com/opinion/articles/2021-08-28/mass-migrations-could-yet-bring-europe-down

Decline and Fall of the Roman Empire 2.0

https://englundmacro.blogspot.com/2019/12/decline-and-fall-of-roman-empire-20.html