And frankly, this is some of the less graphic examples of it. Now, as we get into the first millennium, especially the middle part of the first millennium, we start to see some other significant cultures and civilizations emerge. So for example, around 500 CE, so roughly 1500 years ago, you see the Wari civilization emerge, and that's here in red. And there's some debates. And you'll see these debates a lot as we study ancient history. Was it an empire or was it just a culture that had a lot of influence? Some of the arguments for empire, it seemed like there was wealth.