Valdemar II
Banned
If I remember correctly there was three Indian and inuit wave to America. the first one was in 10000-8000 Bc the second two was in 4000 and 3000 (inuits) BC. There was quite few members of these migrations, so it's unlikely they would have big effect if they stayued in Siberia.
Beside that there seem to have been a minor migration wave from Europe, which was overrun by the proto-Indians.
What would happen if these failed. Likely the Norse would have started colonised around 1000, likely many area would still be unsettled by 1500, but most of the east coast of America would have been settle by then, some plant would likely be domesticated, the potatoes (the Andean would likely be settle surprisingly fast) and beans is almost unavoideble, while mais wouldn't, likely we also see some domestication of wild rice (the Norse lacked tropical and subtropical crops). Much of the old megafauna would likely survive, primary because European expansion into the plain region and inland tropical and subtropical areas would be rather slow (Amazonas would likely still be almost devoid of Humans by 1500, through the plains would likely have a begining semi-nomadic herder society).
Beside that there seem to have been a minor migration wave from Europe, which was overrun by the proto-Indians.
What would happen if these failed. Likely the Norse would have started colonised around 1000, likely many area would still be unsettled by 1500, but most of the east coast of America would have been settle by then, some plant would likely be domesticated, the potatoes (the Andean would likely be settle surprisingly fast) and beans is almost unavoideble, while mais wouldn't, likely we also see some domestication of wild rice (the Norse lacked tropical and subtropical crops). Much of the old megafauna would likely survive, primary because European expansion into the plain region and inland tropical and subtropical areas would be rather slow (Amazonas would likely still be almost devoid of Humans by 1500, through the plains would likely have a begining semi-nomadic herder society).