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what if native Indian began domesticating wild rice and common bean in the Colorado river delta in the same time that meso-american domesticated maize in 8.000 BC. it took 5.000 years to make maize from teosinte. let say that wild rice domestication is far more easier than maize. let say they got break on domesticated animal. water-buffalo like cattle species survived extinction on the Colorado river delta. so they domesticated water-buffalo like animal .
let say that first towns emerge in 5.000 BC.that is almost 3.000 year earlier than olmec. how fast can the Colorado river civilization develop metallurgy.
the founder population of pre-Colombian Indian that crossed from Asia to Alaska was between 1.000 to 5.000. you can double population that crossed to 10.000. so that native american begin earlier with agriculture.