In the American Midwest, native seed crops goosefoot, sumpweed, and sunflowers were farmed about:

Name: In the American Midwest, native seed crops goosefoot, sumpweed, and sunflowers were farmed about:
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Goosefoot, sumpweed, and sunflowers were farmed in the American Midwest about 6,000-1,000 years before present based on archaeological evidence. This time period corresponds with the development of agriculture in North America known as the Eastern Agricultural Complex.

In the American Midwest, Native Seed Crops Goosefoot, Sumpweed, and Sunflowers