It’s gone. Just like the British and the Spanish Empires. But the fact remains that civilization - by that I mean transportation infrastructure, learning, technology, improved life expectancy, etc. - advanced wherever the Romans conquered. It’s a fact of history, friend. The region in northern and eastern Europe that was not conquered by the Romans stayed barbaric for a very long time. And some historians I have read hold that that is one reason Europe has never been able to unite.
Yes, Rome brought advances along with their thuggery. It is a mixed bag. I am neither praising them nor condeming them.
Northern and Eastern Europe are not to blame for a lack of European unity. It has something to do with numerous different cultures, languages, and a number of differing worldviews. Besides, who says that Europe has to be unified? Must North America also be unified?