The domesticated horse is not native to the Americas. There is perhaps no more important fact when trying to understand how the horse-borne nomadic cultures of the Eurasian Steppe relate to those of the Great Plains. The first domesticated horses arrived in the Americans with European explorer/conquerors and the settler-colonists that followed them. Eventually enough of those horses escaped to create a self-reproducing wild (technically feral, since they were once domesticated) horse population, the mustangs, but they are not indigenous and mustangs were never really the primary source of new horses the way that wild horses on the Steppe were (before someone goes full nerd in the comments, yes I am aware that there were some early equines in the Americas at very early dates, but they were extinct before there was any chance for them to be domesticated).

Horses arrived in the Great Plains from the south via the Spanish and moving through Native American peoples west of the Rocky Mountains by both trade and eventually raiding in the early 1700s. Notably firearms also began moving into the region in the same period, but from the opposite direction, coming from British and French traders to the North and West (the Spanish had regulations against trading firearms to Native Americans, making them unavailable as a source). Both were thus initially expensive trade goods which could only be obtained from outside and then percolated unevenly through the territory; unlike firearms, which remained wholly external in their supply, horses were bred on the plains, but raiding and trade were still essential sources of supply for most peoples on the plains. We’ll get to this more when we talk about warfare (where we’ll get into the four different military systems created by this diffusion), but being in a position where one’s neighbors had either the horse or the gun and your tribe did not was an extreme military disadvantage and it’s clear that the “falling out” period whereby these two military innovations distributed over the area was very disruptive.

But unlike guns, which seem to have had massive military impacts but only minimal subsistence impacts (a bow being just as good for hunting bison as a musket, generally), the arrival of the horse had massive subsistence impacts because it made hunting wildly more effective. But the key thing to remember here is: the horse was introduced to the Great Plains no earlier than 1700, horse availability expanded only slowly over the area, but by 1877 (with the end of the Black Hills War), true Native American independence on the Great Plains was functionally over. Consequently, unlike the Steppe, where we have a fairly “set” system that had already been refined for centuries, all we see of the Plains Native American horse-based subsistence system is rapid change. There was no finally reached stable end state, as far as I can tell.

Though there is considerable variation and also severe limits to the evidence, it seems that prior to the arrival of the horse, most Native peoples around the Great Plains practiced two major subsistence systems: nomadic hunter-gathering on foot (distinct from what will follow in that it places much more emphasis on the gathering part) on the one hand and a mixed subsistence system of small-scale farming mixed seasonally with plains hunting seems to have been the main options pre-horse, based on the degree to which the local area permitted farming in this way (for more on those, note Isenberg, op. cit., 31-40). Secoy (op. cit.) notes that while there is some evidence that the Plains Apache may have shifted through both systems, being hunter-gatherers prior to the arrival of horses, by the time the evidence lets us see clearly (which is shortly post-horse) they are subsisting by shifting annually between sedentary agricultural racheirias (from the Spring to about August) and hunting bison on the plains during the fall. Isenberg notes the Native Americans of the Missouri river combining corn agriculture with cooperative bison hunting in the off-season (in that case, in the summer). Meanwhile, the Comanches and Kiowas seem to have mostly subsisted on pedestrian bison hunting along with gathering fruit and nuts, with relatively little agriculture, prior to going fully nomadic once they acquired horses. Bison hunting on foot required a lot of cooperation (so a group) and it seems clear that it was not enough to support a group on its own and had to be supplemented somehow, at least before the arrival of the horse. Some mix of either bison+gathering or bison+horticulture was required.

Isenberg argues (op. cit.), that at this point the clear advantage was to what he terms the “villagers” – that is the farmer-hunters who lived in villages, rather than the nomadic hunter-gathers. These horticulturists were more numerous and seem quite clearly to have had the better land and living conditions. Essentially the hunter-gatherers stuck on marginal land were mostly hunter-gatherers because they were stuck on marginal land, which created a reinforcing cycle of being stuck on marginal land (the group is weak due to small group size because the land is marginal and because the group is weak, it is only able to hold on to marginal lands). That system was stable without outside disruption. The horse changed everything.

A skilled Native American hunter on a horse, armed with a bow, could hunt bison wildly more effectively than on foot. They could be found more rapidly, followed at speed and shot in relative safety. It is striking that while pedestrian bison hunting was clearly a team effort, a hunter on a horse could potentially hunt effectively alone or in much smaller groups. In turn, that massively increased effectiveness in hunting allowed the Native Americans of the region, once they got enough horses, to go “full nomad” and build a subsistence system focused entirely on hunting bison, supplemented by trading the hides and other products of the bison with the (increasingly sedentary and agrarian) peoples around the edges of the Plains. Many of the common visual markers of Plains Native Americans – the tipi, the travois, the short bow for use from horseback – had existed before among the hunter-gathering peoples, but now spread wore widely as tribes took to horse nomadism and hunting bison full time. At the same time, Isenberg (op. cit. 50-52) has some fascinating paragraphs on all sorts of little material culture changes in terms of clothing, home-wares, tools and so on that changed to accommodate this new lifestyle. The speed of the shift is quite frankly stunning.

We’ll come back to this later, but I also want to note here that this also radically changed the military balance between the nomads and the sedentary peoples. The greater effectiveness of bison hunting meant that the horse nomads could maintain larger group sizes (than as hunter-gatherers, although eventually they also came to outnumber their sedentary neighbors, though smallpox – which struck the latter harder than the former – had something to do with that too), while possession of the horse itself was a huge military advantage. Thus by 1830 or so, the Ute and Comanche pushed the Apache off of much of their northern territory, while the Shoshone, some of the earliest adopters of the horse, expanded rapidly north and east over the Northern Plains, driving all before them (Secoy, op. cit., 30-31, 33). Other tribes were compelled to buy, raise or steal horses and adopt the same lifestyle to compete effectively. It was a big deal, we’ll talk about specifics later.

Bret Devereaux, “That Dothraki Horde, Part II: Subsistence on the Hoof”, A Collection of Unmitigated Pedantry, 2020-12-11.