From the classical period to the discovery of the New World (say 1200 bH to 1000 aH), trade therefore made the Middle West the focal point of the Old World, and much wealth ended up there. At about the midpoint of this period, as the dates indicate, Islam appeared, and very quickly it came to dominate the world. Very likely there were some underlying economic reasons for this phenomenon; Islam, perhaps by chance but perhaps not, appeared in the 'centre of the world', the area sometimes called the Isthmus Region, bounded by the Persian Gulf, the Red Sea, the Mediterranean, the Black Sea and the Caspian Sea. All the trade routes necessarily knotted here, like dragon arteries in a feng shui analysis. So it is not particularly surprising that for a time Islam provided the world with a general currency, the dinar, and a generally used language, Arabic. But it was also a religion, indeed it became almost the universal religion, and we must understand that its appeal as a religion arose partly from the fact that in a world of growing inequalities, Islam spoke of a realm in which all were equal – all equal before God no matter their age, gender, occupation, race or nationality. Islam's appeal lay in this, that inequality could be neutralized and done away with in the most important realm, the eternal realm of the spirit.
Meanwhile, however, trade in food and in luxury goods continued all across the Old World, from al Andalus to China, in animals, timber and metals, cloth, glass, writing materials, opium, medicines and, more and more as the centuries passed, in slaves. The slaves came chiefly from Africa; and they became more important because there was more labour to be done, while at the same time the mechanical improvements allowing for more powerful tools had not yet been made, so that all this new work had to be accomplished by animal and human effort alone. So, added to the subjugation of farmers, women, and the family, was this fourth inequality, of race or group, leading to the subjugation of the most powerless peoples to slavery. And the unequal accumulation of wealth by the elites continued.
The discovery of the New World has only accelerated these processes, providing both more wealth and more slaves. The trade routes themselves have moved substantially from land to sea, and Islam no longer controls the crossroads as it did for a thousand years. The main centre of accumulation has shifted to China; indeed, China may have been the centre all along. It has always had the most people; and from ancient times people everywhere else have traded for Chinese goods. Rome's trade balance with China was so poor that it lost a million ounces of silver a year to China. Silk, porcelain, sandalwood, pepper – Rome and all the rest of the world sent their gold to China for these products, and China grew rich. And now that China has taken control of the west coasts of the New World, it has also begun to enjoy a direct infusion of huge amounts of gold and silver, and slaves. This doubled gathering of wealth, both by trade of manufactured goods and by direct extraction, is something new, a kind of cumulation of accumulations.
So it seems apparent that the Chinese are the rising dominant power in the world, in competition with the previous dominant power, Dar al Islam, which still exerts a powerful attraction to people hoping for justice before God, if no longer much expecting it on Earth. India then exists as a third culture between the other two, a go between and influence on both, while also of course influenced by both. Meanwhile the primitive New World cultures, newly connected to the bulk of humanity, immediately subjugated by them, struggle to survive.
So. To a very great extent human history has been the story of the unequal accumulation of harvested wealth, shifting from one centre of power to another, while always expanding the four great inequalities. This is history. Nowhere, as far as I know, has there ever been a civilization or moment when the wealth of the harvests, created by all, has been equitably distributed. Power has been exerted wherever it can be, and each successful coercion has done its part to add to the general inequality, which has risen in direct proportion to the wealth gathered; for wealth and power are much the same. The possessors of the wealth in effect buy the armed power they need to enforce the growing inequality. And so the cycle continues.