I'd actually say that continued existence of western civilization is going to need nationalism as at least a small bulwark against Globalism. Primordialism just doesn't make sense anywhere in the West (or really most of Europe). Besides, that emerged from the Enlightenment as well, so it too would be "Left" or "Liberal" to you.

I wouldn't describe it as such.

I would because they did. When a king gives up some amount of power to the legislature as the result of a Liberal reform movement, that's a political concession to the Liberals.