Nope, not particularly, I'm not really up for a debate on the intricies of Sioux culture and language. But thanks for the offer. Ciosa as GM will decide what's canon to the game world and that's really all that matters.
Just fyi - the information I provided is directly from a friend who is a Native American History professor, who is herself Ashininabe. Yes, Sioux is a French version of the Ojibwa word nadewisou, which means 'treacherous snakes.' The Native name for Sioux means 'an alliance of friends.' But I have to contradict you and mention that there are three distinct languages within the Sioux Nation, (Lakota - spoken by seven tribes, Western Dakota - spoken by two, and Eastern Dakota spoken by four) so not all bands share the same language or, as Ciosa pointed out earlier, culture.
As you said, you can't say one small band is the same as another. They're all very distinct and unique, even when they do share common qualities.
No big deal. Kuro and I are simply discussing an interesting topic and coming from different angles. I too have interviewed and spoken with Lakota and "Sioux" and have gotten different information and points of view than she has from no less esteemed sources. Part of it is an issue between modern political alliances and pre-European contact as well. So much has changed between European contact and now that it is a difficult and complex topic especially for Non-Native Americans.
I have become a huge supporter of Native American rights since leaning more about them and much of the information on the Internet is wrong. However my specialty is more Native Californians and to a lesser extent South Western tribes.
Again the game is the game and apparently secret story wise the Sioux are in Gamorra for a reason no one knows about.
Their are canon reasons in the game that the Native Americans will have reason to work together, but I don't care to discuss them; they're major spoiler territory, and I'll leave it at that. The Sioux Union present in Gomorra is a pastiche of different cultures and tribes, but that's because there are a number of tribes living together, even tribes that historically were enemies with one another. In general, I intend to play the tribes as historically accurate and culturally accurately as I can, but I also don't have the time or energy to read a small library to become familiar with a tribe. I apologize if there are minor inaccuracies - I'll do my best to correct them if they're pointed out.
I would appreciate any reliable links on the culture of the Sioux - which is the name of the political body they've created for themselves, probably ironically, in the face of the Union attempting to seize Deadwood and the Black Hills. Please PM them to me, and I'll familiarize myself with as much as I can. The Natives that are present in Gomorra are representatives of literally over a dozen tribes, not all of them belonging to the Black Hills family - there are Apache and Navajo for instance.
In general, I'd request that debates about historical accuracy/inaccuracy be done privately, mostly because some people can find they make a game a little tense. This is a fantasy game set in a pseudo-historical setting, and there are people riding around in airships and dragons eating poor miners in the remains of California.
I don't believe anyone is going to mistake it for factual history, so errors and gaffes may happen, and I'll ask everyone to put on their fuzzy glasses when that happens and nod and enjoy the narrative without getting too hung up on the details.