Around the world at that time, at the time of the Mississippian culture, there weren't many cities in the world that had 40,000 people. So it wasn't these just hunter-gatherers and people who were nomadic. There were sophisticated civilizations with sophisticated cultures and dense population centers. And it had also been in place for a long time, similar in time frame to some of the great ancient civilizations that we see in Mesopotamia, the Indus Valley, and in China. For example, the oldest civilization we know of in Mesoamerica is the Olmec civilization, right over here. Here's a few of their artifacts they have. If we go into the Andes, near modern-day Peru, we have the Chavin culture, right over there.