Great, except your wrong.

The native Americans had a complex social and economic culture that included payments in labor and material goods, in essence taxes, given by individuals and families to the tribe. And gifts and/or offerings to disadvantaged persons within the tribe, essentially welfare. These were couched in terms of donations and charity but within the context of a tightly interdependent tribe failure to meet these obligations often met with stiff social sanctions.

The potlatch is a well known form of redistribution of wealth but most tribes had some form of wealth redistribution, welfare, socialization of risk, large collective projects (including huge building projects and war) and effective taxation in one form or another. Usually enforced by sanctions on those who do not comply.

The idea that the native Americans had some 'Freeman' paradise is simply a myth. A myth that goes along with the idea that somehow nature is inherently less toxic and more 'clean'. Nature isn't inherently clean in any modern sense. Nature is alive with pathogens, parasites and toxins. Some of these make most man made toxins and pollutants pale in comparison. Eat the wrong mushroom, the wrong portion of a polar bear or the wrong berry and your would have been better off spicing up your meal with a can of Raid.

Modern man also operates at something of a deficit. We have developed a complex infrastructure that keeps us away from most natural pathogens and toxins. Into the 1890s most rural people were exposed to giardia and after a protracted disease cycle, and some number of deaths, they developed some level of immunity. In many rural locations it was common for young kids to get sick and to transition to some level of immunity to the local mix of endemic and naturally occurring pathogens, toxins and parasites.

Now most Americans can go through their entire life without being exposed to giardia. This only becomes a problem when non-immune individuals step outside of the protective infrastructure and fail to take proper precautions.

In this sense there are no safe locations simply because, as the joke goes 'Bears [defecate] in the woods'. Outside a very few spots, like certain springs not too far from my location, deep wells and the ice in certain remote locations there is no safe standing waters in the US. And this only considers the naturally occurring pathogens. The same is true of the plants and animal foods gathered in remote locations. They usually have to be processed, washed at a minimum and/or cooked, to be safely eaten.

Nature itself is not inherently more safe from toxins and pathogens than a urban environment. Humans create safe zones and sources but, as a consequence, end up creating highly toxic zones. The wilderness is less toxic than the worse of the toxic zones made by man but very few places ever become as safe as the human created safe zones.