I think I can give you part of the answer.
After Confederation, we had to wait 84 years for registered Indians and other indigenous groups in Canada to get the vote.
Today, the First Nations peoples don't just vote, they are also engaged in local, territorial, provincial and federal politics.
Of course, having been excluded for a number of years meant that we were able to implement our own local policies and have our own way of administering our affairs.
Having been faced with exclusion probably meant that we didn't feel involved in the entire process. We were not included in the decisions, we were not included in developing the policies. Obviously, that had an impact on turnout.
That's my interpretation of the question.