So I've had a major question in my head and I did some research. So What if when Humans first cross over into the New World, they bring Dogs with them (I can't find if they brought cats with them or not, But I'm assuming they did), these species don't go extinct and are instead domesticated by the Humans - Shrub-Ox (Euceratherium collinum), Dire Wolf (Aenocyon dirus)/Red Fox (Vulpes Vulpes)/Gray Fox (Urocyon cinereoargenteus)/Coyote Canis Latrans) if another Dog Species is needed or something, Homotherium or the Scimitar Toothed Cat if Cats are needed, Mylohyus, Turkeys, and the Western Horse (Equus occidentalis) as the Domesticated species (it doesn't have to be every one of the these animals that are suggested, just ones needed to make a civilization sustainable) followed by a Crop Package of Maize/Corn, Wild Mississippi Rice, Sweet Potatoes, Tomatoes, Peppers, Sunflowers, Pumpkins, Squash, Beans, Blueberries, and Black Walnuts. How successful do you think this civililzation would be with these two factors when placing it in the St. Louis area (meeting point of the Mississippi & Missouri Rivers) say 6000-5000 years ago?
Also, with such a large river system (pictured below, will the Plains be Nomadic in this world or be filled with City States and Kingdoms until you go deeper to Montana/Wyoming? (was originally going to ask about how to have civilizations emerge in the Amazon Mouth Basin, Orinoco river basin, and Rio Grande basin, but those are questions for another day)
Also, with such a large river system (pictured below, will the Plains be Nomadic in this world or be filled with City States and Kingdoms until you go deeper to Montana/Wyoming? (was originally going to ask about how to have civilizations emerge in the Amazon Mouth Basin, Orinoco river basin, and Rio Grande basin, but those are questions for another day)