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Before the Mongols' rise, the Old World system consisted of isolated imperial systems.

The Pax Mongolica ("Mongol Peace"), less often known as Pax Tatarica ("Tatar Peace"), is a historiographical term modelled after the original phrase Pax Romana which describes the stabilizing effects of the conquests of the Mongol Empire on the social, cultural and economic life of the inhabitants of the vast Eurasian territory that the Mongols conquered in the 13th and 14th centuries. The term is used to describe the eased communication and commerce the unified administration helped to create and the period of relative peace that followed the Mongols' vast conquests.
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At its height, the Mongolian empire stretched from Shanhaiguan in the east to Budapest in the west, from Rus' in the north to Tibet in the south. This meant that an extremely large part of the continent was united under one political authority. As a result, the trade routes used by merchants became safe for travel, resulting in an overall growth and expansion of trade from China in the east to Britain in the west. Thus, the Pax Mongolica greatly influenced many civilizations in Eurasia during the 13th and 14th centuries

Under the Mongols new technologies and commodities were exchanged across the Old World, particularly Eurasia. Thomas T. Allsen noted many personnel exchanges occurred during the Mongol period. There were many significant developments in economy (especially trade and public finance), military, medicine, agriculture, cuisine, astronomy, printing, geography, and historiography, which were not limited to Eurasia but also included North Africa.

The new Mongol empire amalgamated the once isolated civilizations into a new continental system, and re-established the Silk Road as a dominant method of transportation. The unification of Eurasia under the Mongols greatly diminished the number of competing tribute gatherers throughout the trade network and assured greater safety and security in travel. During the Pax Mongolica, European merchants like Marco Polo made their way from Europe to China on the well-maintained and well travelled roads that linked Anatolia to China.

On the Silk Road caravans with Chinese silk; pepper, ginger, cinnamon, and nutmeg came to the West from the Spice Islands via the transcontinental trade routes. Eastern diets were introduced to Europeans as well. Indian muslins, cottons, pearls, and precious stones were sold in Europe, as well as weapons, carpets, and leather goods from IranGunpowder was also introduced to Europe from China.

In the opposite direction, Europeans sent silver, fine cloth, horses, linen, and other goods to the near and far East. Increasing trade and commerce meant that the respective nations and societies increased their exposure to new goods and markets, thus increasing the GDP of each nation or society that was involved in the trade system. Μany of the cities participating in the 13th century world trade system grew rapidly in size.

Along with land trade routes, a Maritime Silk Road contributed to the flow of goods and establishment of a Pax Mongolica. This Maritime Silk Road started with short coastal routes in Southern China. As technology and navigation progressed these routes developed into a high-seas route into the Indian Ocean. Eventually these routes further developed encompassing the Arabian Sea, Persian Gulf, Red Sea, and the sea off East Africa.

Along with tangible goods, people, techniques, information, and ideas moved lucidly across the Eurasian landmass for the first time. For example, John of Montecorvino, archbishop of Beijing founded Roman Catholic missions in India and China and also translated the New Testament into the Mongolian language. Long-distance trade brought new methods of doing business from the far East to Europe; bills of exchange, deposit banking, and insurance were introduced to Europe during the Pax Mongolica. Bills of exchange made it significantly easier to travel long distances because a traveller would not be burdened by the weight of metal coins.

Islamic methods of mathematics, astronomy, and science made their way to Africa, East Asia and Europe during the Pax Mongolica. Methods of paper-making and printing made their way from China to Europe. Mongol elements including the ʼPhags-pa script made numerous appearances in western art (see Mongol elements in Western medieval art). Rudimentary banking systems were established, and money changing and credit extension were common, resulting in large amounts of merchant wealth.
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The conquests of Genghis Khan (r. 1206–1227) and his successors, spanning from Southeast Asia to Eastern Europe, effectively connected the Eastern world with the Western world. The Silk Road, connecting trade centres across Asia and Europe, came under the sole rule of the Mongol Empire. It was commonly said that "a maiden bearing a nugget of gold on her head could wander safely throughout the realm". Despite the political fragmentation of the Mongol Empire into four khanates (Yuan dynasty, Golden Horde, Chagatai Khanate and Ilkhanate), nearly a century of conquest and civil war was followed by relative stability in the early 14th century. The end of the Pax Mongolica was marked by the disintegration of the khanates and the outbreak of the Black Death in Asia which spread along trade routes to much of the world in the mid-14th century.

https://en.wikipedia.org/wiki/Pax_Mongolica
https://en.wikipedia.org/wiki/Silk_Road .