Luria had the political instability that comes with lots of nobles and limited positions. That's why it fractured and was the political hotbed of the island. Lots of nobles, few positions.
Indeed, when we started in Morek, we never ever dreamed that we would end up controlling so much land. We thought 20 regions would be an un-achievable pipe dream.
One can't reduce Lurian culture to density alone. I don't believe that other realms had much less nobles, if any less, when things started. However, Luria is the sole realm which failed to produce any colonies. It was always more self-centered.
That being said, it hasn't fractured significantly in a while, either, and it got big through (illegal) peaceful merger.
