Obviously you have never been to the Canadian War Museum. There are no indigenous people in North America but those who arrived here across the Bering Strait centuries ago were no different than those who came in the 15th century - they indulged in warfare, slavery, slaughter and were "environmentally sensitive" only to the extent that they were (technologically) incapable of doing much harm - there just weren't that many of them, nor were they able to harness the resources of their 'territories' anywhere near approaching the (rapacious) manner in which we do in the 21st century. That said, it is 2017, not 1417.