I think you may have a rather stereotypical view of the natives. Not all natives were Sioux. A lot of the natives (probably the majority) were farmers themselves. And a most of them were rather friendly towards the early colonists and eager to trade with them and intermingle. If the Europeans simply taught the natives their higher efficiency farming methods, there would not be a conflict for land either, because America has enough land to support much larger populations than were present at the time.<p>Of course some natives were hunter gatherers and they would have to change their lifestyles, so I am sure there would be some battles, but if the hunter gatherers had an option to assimilate, they would not fight to the death either, they would eventually see that there is no way out after losing a couple of battles. So there may be some war but there would not be genocide. As it happened, they only fought to the death because they knew there wasn't another option.