But if you fast forward 200 years, you see a major change. And in fact, you wouldn't even have to go all the way to 800, even by the early eighth century, you see that Islam has spread from the Iberian Peninsula all the way to the Indus. And most of this, as mentioned, happens within 100 years after Muhammad's death. But let's ask our central question. Why did Islam emerge so rapidly where and when it did? And there's no clear right or wrong answer here, it's all going to be conjecture, but that's what's fun about history. We can think about what we think we know, and then we can debate and think about, are there some patterns here that we see over and over in history?