Roughly speaking, Roman Britain corresponds to England, and unconquered Britain corresponds to Scotland (and Wales), with Hadrian's Wall proximate to the dividing linen between England and Scotland to this day (though granted, that border has moved back and forth a bit over time).

Can one posit that the current divisions and distinctions between England and Scotland go all the way back to this Roman high-water mark? Did the mere fact of having a border in that location for such a long period of time, and/or the Romanization of natives south of Hadrian's Wall, create such a distinct culture and hence "otherness" to the people on the other side that we still feel the ramifications?

I recognize that a lot has happened in the intervening centuries since the Roman occupation of Britain - immigration of Angles, Saxons, Jutes, Danes, Normans, etc. Yet it seems as though there's always been a boundary of nationalities at about this location, so I'm curious whether there's a connection, or if instead it's merely a correlation.