The great physical, ethnic and linguistic divisions of the past were much harder to overcome than are their equivalents today. This is because of improved communication, the spread of English as a global lingua franca among the educated, mass education, mass production of commonly required artefacts, and so on. A traveller can still see exotic or unfamiliar clothes in some countries, but more people over most of the globe now dress alike than ever before. Kilts, kaftans, kimonos are becoming tourist souvenirs, or the carefully preserved relics of a sentimentalized past, while in some areas traditional clothing is seen by others as the sign of poverty and backwardness. The efforts of a few self-consciously conservative and nationalist regimes to cling to the symbols of their past only bear this out. Iranian revolutionaries put women back into the
However, the basis of shared experience now available is only secondarily a consequence of any conscious commitment. Perhaps that is one reason why it has been so neglected by historians, and has tended to lie below their horizon of interest. Yet in a relatively short time, millions of men and women of different cultures have been in some degree liberated from, for example, many effects of climatic differences by electricity, air-conditioning and medicine. Cities all over the world now take street lighting and traffic signals for granted, have policemen on point duty, transact business in similar ways in banks and supermarkets. Much the same goods can be bought in them as are available in most other countries (in season, the Japanese now sell Christmas cakes). Men who do not understand one another’s languages service the same machines in different countries. Motor cars are everywhere a nuisance. Rural districts still escape some of these concomitants of modern life in some places, but big cities, which now for the first time in human history contain more people than do rural areas, do not. Yet for millions of their inhabitants the experiences they share are also ones of squalor, economic precariousness and comparative deprivation. Whatever the differences in their Muslim, Hindu and Christian origins, and whether they shelter mosques, temples or churches, Cairo, Calcutta and Rio offer much the same misery (and, for a few, a similar opulence). Other misfortunes, too, are now more easily shared. The mingling of peoples made possible by modern transport means that diseases are shared as never before, thanks to the wiping out of old immunities. AIDS has now appeared in every continent (except, possibly, Antarctica), and we are told it is killing nearly 6,000 people a day.
Even a few centuries ago a traveller from imperial Rome to imperial Luoyang, the Han capital, would have found many more contrasts than a modern successor. Rich and poor would have worn clothes cut differently and made from different materials than those he knew, the food he was offered would be unusual, he would have seen animals of unfamiliar breeds in the streets, soldiers whose weapons and armour looked quite unlike what he had left behind. Even wheelbarrows had a different shape. A modern American or European in Beijing or Shanghai need see little that is surprising even in a country that is still in many ways deeply conservative; if he chooses Chinese cuisine (he will not need to) it will seem distinctive, but a Chinese airliner looks like any other and Chinese girls wear fishnet tights. It is only a little while ago that junks were China’s ocean-going ships, and looked wholly unlike contemporary European cogs or caravels.