Possible New plot solution on obtaining Lakota and Haudenosaunee coins

In fact I proposed something like this:

It makes sense if mechanics is associated in some way with Europeans, but not as it is currently.

The game is not historically accurate, but it is based on history.

The mechanics itself is not the problem, it is the argument. I am willing to alter the gameplay of these two civilizations in order to see a more ingenious mechanic that is something deeper and unique.