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During the most recent of the Ice Ages, lasting from 30,000 to 10,000 years ago, an undersea ridge between Siberia and Alaska emerges from the sea.Known as the Bering Land Bridge, it lies partly south of the ice cap.From about 7000 years ago human groups adapt to the conditions of the northern coast of Canada, living mainly as hunters of sea mammals.They spread gradually eastwards along the edge of the Arctic Circle, eventually reaching Greenland.But by 3000 BC the people of this area are settled agriculturalists.In this development they are followed by the hunter-gatherers of south America and then, considerably later, by some in the northern part of the continent.They are followed, about three centuries later, by the earliest civilization of south America - the Chavin culture of Peru.
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When the melting ice submerges the bridge, about 10,000 years ago, these northeast Asians become isolated as the aboriginal Americans.
The Siberian hunter-gatherers probably make their way along the north coast of Alaska and down through the valley of the Mackenzie river.
Squash and chili are the earliest plants to be grown - soon followed by corn (or maize) and then by beans and gourds.
These are all species which need to be individually planted, rather than their seeds being scattered or sown over broken ground.