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first Eastern Agricultural Complex begin earlier plant domestication 8000 to 6000 BCE instead of 3000 to 2000 BCE. So that goose-foot and wild rice and little barley and may-grass and stump-weed have 8000 years to domesticated as maize instead of 4000 years as OTL.
earlier development of balsa ship . So that maritime trade between Mexico and Peru begin in 1000 BCE instead of 1 BCE as OTL. plus maritime trade between Mississippi delta and Mexico.
earlier bronze metallurgy in great lake region in 500 CE instead 1400 CE in Mexico as in OTL