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If you are unfamiliar with the history of humanity presented in The Urantia Book, you may want to start by reviewing Genetic Introductions, Mutations, and Evolution: a Urantia Book perspective.
The short version is that the human genetic mutation occurred 1,000,000 years ago, which is termed Andonite. The mutation did not produce sufficient intelligence for civilization to develop. Another mutation occurred 500,000 years ago near Afghanistan, giving rise to six colored races. To greater and lesser degrees, all of these races possessed sufficient intelligence for the development of civilization. Genetic develops occurred around 200,000 years ago and 37,000 years ago that do not summarize easily. But suffice it to say, these relate to the Nodites and Adamites, respectively. The mix of Nodite and Adamite is termed Andite. Nodites relates to our poorly preserved records of the Nephilim, who, during the times of Adam, had a cultural center known as the Land of Nod.
Climate and Geology
(78:3.5) As the period of the early Adamic migrations ended, about 15,000 B.C., …
(78:3.7) The Saharan civilization had been disrupted by drought and that of the Mediterranean basin by flood.
Green to desert in a flash Live Science
Three Ancient Rivers Smithsonian
Lost Forest Satellite National Geographic
TransAfrican seaway LiveScience
Civilizations
(78:1.10) The Sahara civilization. The superior elements of the indigo race had their most progressive settlements in what is now the great Sahara desert. This indigo-black group carried extensive strains of the submerged orange and green races. [This commentary relates to developments 25,000 years ago.]
(78:3.5) As the period of the early Adamic migrations ended, about 15,000 B.C., …
(78:3.7) The Saharan civilization had been disrupted by drought and that of the Mediterranean basin by flood. The blue races had, as yet, failed to develop an advanced culture. The Andonites were still scattered over the Arctic and central Asian regions. The green and orange races had been exterminated as such. The indigo race was moving south in Africa, there to begin its slow but long-continued racial deterioration.
(80:1.1) Before the last Andites were driven out of the Euphrates valley, many of their brethren had entered Europe as adventurers, teachers, traders, and warriors. During the earlier days of the violet race the Mediterranean trough was protected by the Gibraltar isthmus and the Sicilian land bridge. Some of man’s very early maritime commerce was established on these inland lakes, where blue men from the north and the Saharans from the south met Nodites and Adamites from the east.
(80:1.2) In the eastern trough of the Mediterranean the Nodites had established one of their most extensive cultures and from these centers had penetrated somewhat into southern Europe but more especially into northern Africa. The broad-headed Nodite-Andonite Syrians very early introduced pottery and agriculture in connection with their settlements on the slowly rising Nile delta. They also imported sheep, goats, cattle, and other domesticated animals and brought in greatly improved methods of metalworking, Syria then being the center of that industry.
(80:1.3) For more than thirty thousand years Egypt received a steady stream of Mesopotamians, who brought along their art and culture to enrich that of the Nile valley. But the ingress of large numbers of the Sahara peoples greatly deteriorated the early civilization along the Nile so that Egypt reached its lowest cultural level some fifteen thousand years ago.
(80:1.4) But during earlier times there was little to hinder the westward migration of the Adamites. The Sahara was an open grazing land overspread by herders and agriculturists. These Saharans never engaged in manufacture, nor were they city builders. They were an indigo-black group which carried extensive strains of the extinct green and orange races. But they received a very limited amount of the violet inheritance before the upthrust of land and the shifting water-laden winds dispersed the remnants of this prosperous and peaceful civilization.
(80:2.1) The early expansion of the violet race into Europe was cut short by certain rather sudden climatic and geologic changes. With the retreat of the northern ice fields the water-laden winds from the west shifted to the north, gradually turning the great open pasture regions of Sahara into a barren desert. This drought dispersed the smaller-statured brunets, dark-eyed but long-headed dwellers of the great Sahara plateau.
(80:2.2) The purer indigo elements moved southward to the forests of central Africa, where they have ever since remained. The more mixed groups spread out in three directions: The superior tribes to the west migrated to Spain and thence to adjacent parts of Europe, forming the nucleus of the later Mediterranean long-headed brunet races. The least progressive division to the east of the Sahara plateau migrated to Arabia and thence through northern Mesopotamia and India to faraway Ceylon. The central group moved north and east to the Nile valley and into Palestine.
(78:3.7) The Saharan civilization had been disrupted by drought and that of the Mediterranean basin by flood. The blue races had, as yet, failed to develop an advanced culture. The Andonites were still scattered over the Arctic and central Asian regions. The green and orange races had been exterminated as such. The indigo race was moving south in Africa, there to begin its slow but long-continued racial deterioration.
(78:5.4) By 12,000 B.C. …
(78:5.5) The Andites not only migrated to Europe but to northern China and India, while many groups penetrated to the ends of the earth as missionaries, teachers, and traders. They contributed considerably to the northern groups of the Saharan Sangik peoples. But only a few teachers and traders ever penetrated farther south in Africa than the headwaters of the Nile. Later on, mixed Andites and Egyptians followed down both the east and west coasts of Africa well below the equator, but they did not reach Madagascar.
(78:5.8) The migratory conquests of the Andites continued on down to their final dispersions, from 8000 to 6000 B.C. As they poured out of Mesopotamia, they continuously depleted the biologic reserves of their homelands while markedly strengthening the surrounding peoples. And to every nation to which they journeyed, they contributed humor, art, adventure, music, and manufacture. They were skillful domesticators of animals and expert agriculturists. For the time being, at least, their presence usually improved the religious beliefs and moral practices of the older races. And so the culture of Mesopotamia quietly spread out over Europe, India, China, northern Africa, and the Pacific Islands.
(78:8.3) The peaceful grain growers of the Euphrates and Tigris valleys had long been harassed by the raids of the barbarians of Turkestan and the Iranian plateau. But now a concerted invasion of the Euphrates valley was brought about by the increasing drought of the highland pastures. And this invasion was all the more serious because these surrounding herdsmen and hunters possessed large numbers of tamed horses. It was the possession of horses which gave them a tremendous military advantage over their rich neighbors to the south. In a short time they overran all Mesopotamia, driving forth the last waves of culture which spread out over all of Europe, western Asia, and northern Africa.
(80:3.2) While we speak of the blue man as pervading the European continent, there were scores of racial types. Even thirty-five thousand years ago the European blue races were already a highly blended people carrying strains of both red and yellow, while on the Atlantic coastlands and in the regions of present-day Russia they had absorbed a considerable amount of Andonite blood and to the south were in contact with the Saharan peoples. But it would be fruitless to attempt to enumerate the many racial groups.
(81:3.4) The widespread use of metals was a feature of this era of the early industrial and trading cities. You have already found a bronze culture in Turkestan dating before 9000 B.C., and the Andites early learned to work in iron, gold, and copper, as well. But conditions were very different away from the more advanced centers of civilization. There were no distinct periods, such as the Stone, Bronze, and Iron Ages; all three existed at the same time in different localities.
(81:3.5) Gold was the first metal to be sought by man; it was easy to work and, at first, was used only as an ornament. Copper was next employed but not extensively until it was admixed with tin to make the harder bronze. The discovery of mixing copper and tin to make bronze was made by one of the Adamsonites of Turkestan whose highland copper mine happened to be located alongside a tin deposit.
(81:3.6) With the appearance of crude manufacture and beginning industry, commerce quickly became the most potent influence in the spread of cultural civilization. The opening up of the trade channels by land and by sea greatly facilitated travel and the mixing of cultures as well as the blending of civilizations. By 5000 B.C. the horse was in general use throughout civilized and semicivilized lands. These later races not only had the domesticated horse but also various sorts of wagons and chariots. Ages before, the wheel had been used, but now vehicles so equipped became universally employed both in commerce and war.
(81:3.7) The traveling trader and the roving explorer did more to advance historic civilization than all other influences combined. Military conquests, colonization, and missionary enterprises fostered by the later religions were also factors in the spread of culture; but these were all secondary to the trading relations, which were ever accelerated by the rapidly developing arts and sciences of industry.
(81:3.8) Infusion of the Adamic stock into the human races not only quickened the pace of civilization, but it also greatly stimulated their proclivities toward adventure and exploration to the end that most of Eurasia and northern Africa was presently occupied by the rapidly multiplying mixed descendants of the Andites.