As I expand, this gives me more land and more people to rule over. And I can tax that land and people to have more wealth and larger armies. And so these two things are pretty good ingredients to be able to take on even more of my neighbors and expand even further. And so you might say, well, why doesn't that process just keep on going on indefinitely? Well, it does go pretty far. You see these various empires are quite large, especially when you consider the technology of the time, the communications ability of the time. But at some point, you might have weak leadership.