We hear a lot about the Mayans and Aztecs and the Incan empire existing before the Europeans arrived but we don’t really hear that much about North America, as in the modern 48 United States. Was that area pretty much occupied by hunter gatherers or were there any civilizations?
We get a lot of questions about Cahokia, the Mound Builders, the Mississippians, and other native North American civilizations here. A good place to start would probably be the native civilizations in the Americas section of the FAQ.