Yuval Noah Harari writes: Though human beings are social animals, for millions of years they lived in small, intimate communities numbering no more than a few dozen people. Even today, as the evolutionary biologist Robin Dunbar has shown, most human beings find it impossible properly to know more than 150 individuals, irrespective of how many Face­book “friends” they boast. Human beings easily develop loyalty to small, intimate groups such as a tribe, an infantry company or a family business, but it is hardly natural for them to be loyal to millions of strangers. Such mass loyalties have appeared only in the past few thousand years as a means of solving practical problems that no single tribe could solve by itself. Ancient Egypt was created to help human beings gain control of the River Nile, and ancient China coalesced to help the people restrain the turbulent Yellow River.

Nations solved some problems and created new ones. In particular, big nations led to big wars. Yet people were willing to pay the price in blood, because nations provided them with unprecedented levels of security and prosperity. In the 19th and early 20th centuries the nationalist deal still looked very attractive. Nationalism was leading to horrendous conflicts on an unprecedented scale, but modern nation states also built systems of health care, education and welfare. National health services made Passchendaele and Verdun seem worthwhile.

Yet the invention of nuclear weapons sharply tilted the balance of the deal. After Hiroshima, people no longer feared that nationalism would lead to mere war: they began to fear it would lead to nuclear war. Total annihilation has a way of ­sharpening people’s minds, and thanks in no small measure to the atomic bomb, the impossible happened and the nationalist genie was squeezed at least halfway back into its bottle. Just as the ancient villagers of the Yellow River Basin redirected some of their loyalty from local clans to a much bigger nation that restrained the dangerous river, so in the nuclear age a global community gradually developed over and above the various nations because only such a community could restrain the nuclear demon.

In the 1964 US presidential campaign, Lyndon B Johnson aired the “Daisy” advertisement, one of the most successful pieces of propaganda in the annals of television. The advert opens with a little girl picking and counting the petals of a daisy, but when she reaches ten, a metallic male voice takes over, counting back from ten to zero as in a missile launch countdown. Upon it reaching zero, the bright flash of a nuclear explosion fills the screen, and Candidate Johnson addresses the American public: “These are the stakes – to make a world in which all of God’s children can live, or to go into the dark. We must either love each other. Or we must die.” We often associate the slogan “Make love, not war” with the late-1960s counterculture, but already in 1964 it was accepted wisdom, even among hard-nosed politicians such as Johnson. [Continue reading…]