These holdings do not simply represent those specific Native American nations but are to represent the general culural regions of Native American groups (Northern Plains/Southern Plains/Southwest Desert/Northwest/Canadian Shield). The names used are more for gameplay - we can use Northern Plains Native Americans instead of Sioux, just sounds more bureaucratic.
This was a first draft. In the interim I have found an excellent site maintained by I believe the Library of Congress that provides information, and maps, of lands ceded by Native American peoples. Having found that info I will be making an updated map tonight with some territory changes. Milwaukee and Davenport provinces will go back to the USA, as will the Missouri and Arkansas provinces I have currently put in with the Cherokee, while Western Lower Michigan will start as Sioux and be the first province for transfer (the date of transfer for the majority of that region was in October 1836, just ahead of statheood)
To check out the site, click this :
http://memory.loc.gov/ammem/amlaw/lwss-ilc.html The maps alone are worth checking out!
Again I am trying to capture the territory of a cultural region and there were small bands of Native American communitied in the region. I'd rather have them under native control than blank to my thinking.
That will have to be one of the things we test - hence why this is just a proposal for 0.4, plenty of time to test
Again same answer I'll give for California, I think it makes more sense keeping it as part of Native controlled territory than to call it blank land. We'll see how it goes in testing and it won't be too difficult to change if consensus is the land should be blank.