In ancient Greece, many of the city states had populations largely comprised of slaves; slavery was an integral part of these city-states' economies.

Slavery wasn't outlawed by any means.

Although pseudo-religious rituals were an integral part of the institution of slavery, slavery was primarily an economic activity.

Slavery wasn't just economically feasible, the Greek city-states wouldn't have been able to support their upper classes, and their ensuing quest for knowledge and art, without it.

Although some Greeks did consider slavery unethical, it was practiced nearly universally; not that everyone owned slaves, but slavery was an integral part of every society and therefore every citizen worked in a slave economy.

Marl clay required much more training and constant supervision than Nile clay, which could be constructed into objects by a local potter who also raised animals or crops.

The bow and atlatl were prehistoric tools created by people who themselves used them to hunt.

The earliest alphabets were invented after Marl clay had been introduced into Egyptian societies.

Prior to the Neolithic Revolution job specialization was fairly simple— if you were a man you hunted, if you were a woman you gathered. However, after the invention of agriculture job specialization increased dramatically. The surplus of food allowed many individuals to pursue different kinds of work. Artists, merchants, craftsmen, scribes, soldiers, and priests emerged. This led to an increased interdependence in society, as each individual relied more on others to provide the essential things needed in life.

Specialization in early civilizations would have been most influenced by surplus food. Before the advent of agriculture, most humans had to devote their energy to finding and preparing food. With agriculture allowing people to settle and create civilizations, this meant that fewer people were needed to provide food, and others could specialize in other areas.

Agriculture, the major transformation of the Neolithic Age, allowed people to settle in one place. It also meant that fewer people were needed for the task of providing food since surpluses could be created, allowing other people to specialize in a variety of other skills.

Traditional economies are characterized by long standing values and a focus on subsistence rather than profit. The other practices listed are all ideals of more modern economic theories. 

The Western provinces of Rome's empire, with the exception of Rome itself, were largely rural with economies based on feeding the population of Rome.

Rome was the significant glassmaking center of the ancient world, whereas the Celts never produced fine glasswork.

Although Rome dealt brutally with its enemies, Rome had little desire in turning whole provinces of its own empire into barren wasteland.

Steppes where nomadic horse archers traditionally lived are located in Central Asia, not close to the Mediterranean where Rome's empire was situated.

There were little to no jungles in Rome's empire. Roman soldiers had difficulty fighting in wooded areas, let alone dense jungles.

In the Roman Empire, slavery was an important part of the economy, with most slaves either being born free and then indebted to their masters, or being defeated in war and enslaved by Rome's army.

Although slavery in Rome took into account ethno-linguistic differences, this was largely a result of where Rome's army was fighting; race was never a prerequisite for slavery, in fact for much of the empire's existence most slaves on the Italian peninsula were indigenous.

Although all women lacked political rights, and most women lacked economic rights, many slaves were male, and many women were free.

Plebeians were Romans from low-born families, but they could still be free people even if born into a low caste.

Plenty of free people in ancient Rome practiced all kinds of religions, including monotheistic religions like Judaism.

The Silk Road was a long distance trading network that existed during the ancient and classical eras of human history. It connected East Asia with Europe and the Middle East and allowed goods and products to be exchanged over vast distances. At its height the Silk Road connected the Han Dynasty of China with the Roman Empire in the west.

The Sogdians lived in Central Asia during the classical and medieval periods. Their most important city was Samarkand. The Sogdians were an important merchant society and were incredibly influential in the trade along the Silk Road from China to the Middle East.