Silk Road
The Silk Road was a network of trade and communication routes that connected the civilizations of East Asia, Central Asia, South Asia, the Middle East, and the Mediterranean world from approximately the 2nd century BCE to the 15th century CE. It was not a single road but a complex system of overland and maritime corridors through which goods, ideas, technologies, and religions moved across Eurasia. The term was coined in 1877 by the Prussian geographer Ferdinand von Richthofen and has since become a standard designation for the entire network of trans-Eurasian exchange, encompassing the Northwest Silk Road, the Steppe Silk Road, the Maritime Silk Road, and the Southwest Silk Road.
The origins of the Silk Road lie in the strategic expansion of the Han dynasty under Emperor Wu, who dispatched the diplomat Zhang Qian on missions to Central Asia in the 2nd century BCE. The Han conquest of the Hexi Corridor and the establishment of the Protectorate of the Western Regions created the security conditions that made sustained long-distance trade possible. The Silk Road flourished when powerful empires — the Han and Tang dynasties in China, the Kushan Empire in Central Asia, the Sasanian and Islamic empires in Persia, and the Mongol Empire across all of Eurasia — imposed political stability and protected the movement of merchants, diplomats, and missionaries. When imperial authority collapsed, as after the Tang withdrawal from Central Asia following the An Lushan Rebellion, the overland routes were disrupted.
The Silk Road reached its peak of integration under the Mongol Empire in the 13th and 14th centuries, when the entire network from the Pacific to the Mediterranean was governed by a single political authority. The Pax Mongolica enabled an unprecedented flow of goods — including silk, spices, horses, porcelain, and furs — and an equally consequential exchange of religions, technologies, and scientific knowledge. Buddhism spread from India to China via the Silk Road. Islam expanded into Central Asia, South Asia, and Southeast Asia. Papermaking, gunpowder, and the compass traveled westward, transforming societies across Eurasia. The Sogdian trading network, based in the oasis cities of Samarkand and Bukhara, served as the primary commercial intermediary during the 5th to 8th centuries, while Austronesian sailors dominated the Maritime Silk Road from Southeast Asia.
The decline of the overland Silk Road resulted from the fragmentation of the Mongol Empire, the devastation of the Black Death, and the progressive shift toward maritime transport that culminated in European exploration of ocean routes to Asia in the 15th and 16th centuries. The concept of the Silk Road was revived in the 19th century by European explorers and historians and has been mobilized in the 21st century by China's Belt and Road Initiative, which explicitly references the historical Silk Road as a model for a new era of Eurasian connectivity. The modern geopolitical competition over Central Asia echoes earlier struggles for control of the Silk Road corridors, from the Han-Xiongnu wars through the Great Game between the British and Russian empires to the contemporary infrastructure rivalries of the Indo-Pacific.