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I know that this appears on the thread all the time, but apparently there are crops from North America.

I'm pulling up an old idea I had about Mound Builder cultures along the Mississippi developing fish-farming, to jumpstart a sedentary life-style, which leads to development and greater things down the road. The fish-farms begin specifically in northern-Louisiana, where Amerindians (in the Archaic Period for the time being) put caught fish into man-made ponds, which are connected to the main river by shallow channels, and blocked off by woven mats. They soon learn that the caught fish which aren't immediately killed breed in the ponds, as well as minnows swim into the pond while they are small enough, and can't get back out. This changes fish-farming, which had spread through the region, and sedentary settlements finally form, slightly early than is generally thought.

My problem is, what crops are native to the area that they could harvest and maybe domesticate? I'm not as concerned with meats, as hunting could supplement their fish supply, but crops are harder. Many decent crops, such as maize and wild rice are found nearby, but none that I can find, are in the direct area. Scuppernongs, grapes, are found in the area, but I doubt that they are helpful as a crop, instead being a supplement, an later good for making alcohol.

Any suggestions on native crops to north Louisiana, or, how maize and wild rice could get there?
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