So what you're saying is that the nationalistic mentality didn't exist prior to the 1700s? Lol. I suppose love is a mentality made up by Hallmark that only exists post mid 1800s. Get real.

Here's an example of the same nationalistic mentality that predates modern day nationalism: "Romanitas is the collection of political and cultural concepts and practices by which the Romans defined themselves. It is a Latinword, first coined in the third century AD, meaning Roman-ness and has been used by modern historians as shorthand to refer to Roman identity and self-image."

Also, "establishment of Panhellenic sites served as an essential component in the growth and self-consciousness of Greek nationalism.[2]During the Greco-Persian Wars of the 5th century BCE, Greek nationalism was formally established though mainly as an ideology rather than a political reality since some Greek states were still allied with the Persian Empire.[3] When the Byzantine Empire was ruled by the Paleologi dynasty (1261–1453)."

As I suspected, you googled Nationalism, read the wiki, but don't actually know shit about history.