Indigenous groups have also been a major sign that cooperation and group solidarity is much closer to our human nature than the suvival of the fittest culture that capitalism nurtures.
Their critiques on European society created a huge wave of political discussion and ideas in Europe, even if they thought of the indigenous people as simple minded savages which they absolutely were not. On the contrary, they showed a much higher capability of quality discussion and reaching a consensus because it was a central part of the way they were organised. The chief didn't have power over them and couldn't command them, the group would have to agree with them in order to do something, so a chief should be very skilled in discussion and very knowledgeable so that they could succesfuly lead the others and gain their trust.
Their critiques were possibly what resulted in the formation of the idea of equality in Europe, a concept that wasn't at all relevant until then.