The Classical World
When America, Australia and Africa remained outside the mainstream of world history, civilizations blossomed in scattered areas of the land mass of Europe and Asia, known as Eurasia. Some of them soon reached the classical stage. When the classical era was at its height, a chain of empires from Rome to Persia to Peshawar, began to emerge. The expansion of major civilizations eliminated the geographical gap and paved the way for inter-regional trade contacts and cultural exchange. This led to the transmission of ideas, technology and art. The diffusion of the great religions of the world, beginning with Buddhism and later continuing with Christianity and Islam, can be understood in this context.
Greece, Rome and China represented the Classical World which ended with the fall of Western Roman Empire. Until the end of 5th century AD (CE) Christianity was confined to the Roman Empire. Later it became a powerful unifying bond in the whole of Europe.