Small Circles, Big Consequences: Us, Them and the Space Between

For most of our time on earth, human life was conducted at a scale that now feels almost impossibly intimate. For roughly ninety-five percent of our existence, the species we call Homo sapiens moved in small bands, twenty, perhaps fifty people at most, drifting across landscapes that were as much home as they were horizon. For more than two hundred and ninety thousand years, we lived this way: hunting, gathering, forming kin-based groups whose size was dictated not by law or infrastructure, but by cognition itself, how many faces one could remember, how many loyalties one could sustain. Only in the last ten thousand years, a sliver of time so narrow it scarcely registers on the evolutionary clock, did we begin to settle, first into villages, then cities, then states, and finally into the sprawling abstractions we now call modern civilization.

And yet, the older architecture persists. Anthropologists have long observed that the outer limit of stable human social networks hovers around one hundred and fifty individuals, a figure that echoes, curiously, in contemporary life. The average Facebook user, even in 2026, maintains a network of roughly that size, with a far smaller inner circle, ten or so people, occupying the space of genuine emotional gravity. The platforms have changed, the geography has dissolved, but the structure remains. We have, in effect, digitized the tribe.

The appeal is not difficult to understand. Tribal life offered a clarity that modern existence often obscures: a dense web of belonging, where each person was known, and each role mattered. Support systems were not institutional but immediate; inequality, while never absent, was constrained by proximity; and the environment was not an abstraction but a daily negotiation. There was purpose in the hunt, in the gathering, in the shared rhythms of survival.

But the same forces that bind can also divide. The logic of the tribe, of “us” and “them,” is efficient, and it is ancient. In its most extreme form, it has proven catastrophic. In 1994, the Rwandan genocide unfolded with terrifying speed, as extremist elements of the Hutu majority turned on Tutsi and moderate Hutu populations, killing an estimated eight hundred thousand people in just one hundred days. The violence, sparked by the assassination of Juvénal Habyarimana, was carried out not only by organized militias but by ordinary civilians, neighbors, in many cases, illustrating how quickly tribal identity can be weaponized. The conflict ended only when the Rwandan Patriotic Front seized control, leaving behind a fractured society and a region marked by instability.

Elsewhere, similar patterns have emerged. In Darfur, beginning in 2003, militia groups known as the Janjaweed targeted non-Arab ethnic communities, killing hundreds of thousands and displacing millions. In Iraq, in 2014, ISIS carried out a campaign against the Yazidis, executing men and enslaving women and girls, in what has been widely recognized as genocide. And in Myanmar, since 2016, military operations against the Rohingya have resulted in mass killings, sexual violence, and the displacement of hundreds of thousands into neighboring Bangladesh. The details differ, but the underlying mechanism, the hardening of identity into exclusion, and exclusion into violence, remains consistent.

The lesson is not that tribalism is inherently destructive. On the contrary, it is foundational to who we are. It provides cohesion, meaning, and resilience. But when amplified, when identity becomes absolute, when difference becomes threat, it can produce outcomes of staggering brutality.

In the United States, the fault lines are different, but the pattern is recognizable. The language of political discourse has, in recent years, taken on a distinctly tribal edge, with labels “fascist,” “enemy,” and “traitor,” deployed with increasing frequency and decreasing restraint. History offers uncomfortable parallels; in Rwanda, Tutsis were infamously dehumanized as “cockroaches” before the violence began. The comparison is not exact, nor should it be overstated, but it is difficult to ignore the underlying dynamic: the reduction of opponents into something less than fully human.

The consequences, while not comparable in scale, have begun to surface. Now three attempts on the life of a sitting president, targeted violence against elected officials and their families, and the killing of a Minnesota gubernatorial candidate’s daughter all point, in different ways, to a coarsening of the civic fabric. These are not the outcomes of policy disagreements; they are the byproducts of identity hardened into antagonism.

Tribalism, it seems, has not disappeared. It has simply adapted, migrating from forests and savannas into networks and institutions, from kinship groups into political affiliations. The scale has changed; the wiring has not. And the challenge, as ever, is not to eliminate the instinct, but to contain it, to recognize its power without allowing it to define the boundaries of who belongs, and who does not.