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 == Indians Not Taxed == 

 It might be worth including some clarification about the populations counted, especially for earlier censuses. 

 My suspicion, from looking at the census table that's cited as the source, is that Native Americans aren't counted at all in the data for the Eighteenth and Nineteenth centuries (though I'm not sure at what date they'd start being counted).  My evidence for this is, in part, that the data for Alabama shows no Native American population in the early 1800's, though in 1800 the Native population must have well exceeded the 733 whites and 517 blacks shown. 

 This seems consistent with the Census Clause's exclusion of ""Indians Not Taxed"" from the census, but makes a big difference to the population density for states before heavy white settlement.  (Hawaii being a special case, as I believe the native Hawaiian population have never legally been considered Native Americans, which means they would have been counted.) 

 I think some note about this should be included.  Thoughts?"