Is the increased density in Western Europe caused by unintended bias on Wikipedia (more likely to be documented) or that those places were more war hungry?
Bias, absolutely. I just know, Russia was at war nearly all ~400 years it exist, and with that "liberation" wars against all surrounding peoples, over last 200 years achieve grow of territory about 2x.
So, definitely, Russia should have at least comparable to Europe number of battles on their territory.
So, definitely, Russia should have at least comparable to Europe number of battles on their territory.