Ironside, you underestimate the complexity of the Plains Indian society.
Maybe I'm, however with all their internal and spiritual complexity society of the Plains Indians was pretty simple, no social classes. Simply speaking lack of the factors necessary for existence of civilisation.
The Plains Indians by having domesticated and militarized the horse became the central continental overlords of North America just as the Poles did in central Europe with their own variety of artillery supported equestrian based military technology.
Polish power wasn't based on her military power, for most of her Golden Age, military power was used only for defence purposes, most historians are in concert that one of the downfall of Poland's Power was anti-militaristic attitude of majority of her citizen (nobles).
If Poland would had utilized her riches and potentials, without even straining herself would have had been able to handle all her neighbours.
Military power was there only to provide security for advanced and complex society based on knowledge, agriculture and technology unsuppressed in the world.
Overlords of North America is only an exaggerated expression, which means that because of their numbers, warrior culture and vacuum caused by white men advance into North America which caused havoc therefore wiping out and pushing aside other Indians.Because of all that their ruling "so to speak" was unchallenged.
In no point their overlord-ship meant more than a passing gallop of their horses.
The parallels are there for anyone with eyes to see, but you insist upon the distinguishing the Plains Indians as primitive and the Poles as civilized in a myopic manner.
What parallels you are talking about ?Use of horses and feathers? Well, I can grant you that, but further than that its only confabulation.
There is nothing myopic in my approach, I'm just taking a stand against comparing everything with everything, it makes no sense and is counter-productive.
I did not call Indians primitive on purpose, but their nomadic lifestyle, and even more their ancient but remote culture put them entirely on a different plane of existence than Polish civilization.
That: against that ?:
The first one doesn't even needs his horse to ridicule your comparison.