From about 1450, severe drought and desertification events affected the Dunhuang oasis region, a key chokepoint area for Silk Road travel. Environmental stress made routes harder to use and reduced the capacity of oasis towns to support caravans. These conditions contributed to a sharp decline in overland traffic in parts of the eastern Silk Road during the early 16th century.
On 1453-05-29, the Ottoman Empire captured Constantinople, ending the Byzantine Empire. With a major East–West commercial hub now under Ottoman control, European merchants faced new political and security realities around traditional Mediterranean and overland routes. This shift helped push European states to invest more heavily in alternative sea routes to Asian markets.
On 1494-06-07, Spain and Portugal signed the Treaty of Tordesillas, attempting to divide rights to newly explored lands beyond Europe. The agreement reflects how Atlantic exploration was becoming state policy rather than isolated voyages. Over time, this overseas focus helped build ocean-based trading systems that competed with older overland routes across Asia.
On 1498-05-20, Vasco da Gama reached Calicut (Kozhikode), establishing a direct ocean route between Europe and the Indian Ocean via the Cape of Good Hope. This route offered a scalable alternative to long, multi-state overland caravan systems. Over time, maritime shipping reduced demand for some high-value goods that had previously moved along Silk Road corridors.
In 1501, Ismāʿīl I captured Tabriz and proclaimed himself shah, founding the Safavid dynasty. The new state-building project brought major political and religious change across Iran and its borderlands. Rivalry and warfare among Safavid Iran, the Ottoman Empire, and other powers made some overland corridors less predictable for long-distance merchants.
By the early 1500s, Portuguese naval power increasingly disrupted established Indian Ocean commercial networks. Contemporary accounts of Mamluk naval efforts highlight how competition at sea could reduce the profitability of routes that fed into overland trade systems. As maritime conflict and fort-building expanded, long-distance commerce began to reorganize around controllable sea lanes and ports.
From 1516 to 1517, the Ottoman Empire defeated the Mamluk Sultanate and incorporated the Levant and Egypt. This consolidation strengthened Ottoman influence over key junctions linking the Mediterranean with Red Sea and inland routes. It also tied Eurasian trade more closely to Ottoman policy choices, taxation, and wartime disruptions.
On 1567-01-17, the Ming state created Haicheng County at Yuegang and relaxed maritime prohibitions there, making it a legal outlet for private overseas trade. This policy shift helped channel commerce toward regulated coastal shipping rather than relying on long overland movement across Inner Asia. The change supported the broader early modern trend toward maritime-connected trade hubs.
In 1602, the Dutch East India Company (VOC) was founded to organize and protect Dutch trade in the Indian Ocean. Its scale and state-backed powers helped Europe expand durable ocean supply chains for Asian goods. These institutions made sea trade more competitive and further reduced the relative importance of transcontinental overland caravan routes.
On 1699-01-26, the Treaty of Karlowitz ended major hostilities between the Ottoman Empire and the Holy League and transferred large territories to Habsburg control. The treaty signaled a long-term shift in European power balances near important Balkan and Danube corridors. While not a “Silk Road” event by itself, it reflects the changing political map that shaped the security and costs of overland movement into Europe.
On 1757-06-23, the British East India Company defeated the Nawab of Bengal at the Battle of Plassey. The victory opened the way for the Company to become a major political and military power in India, not just a merchant organization. As European companies gained territorial influence in coastal Asia, maritime empires increasingly shaped the rules and routes of long-distance commerce.
By the late 1700s, long-distance trade between Europe and Asia was increasingly organized around ocean routes and chartered-company systems rather than trans-Inner Asian caravans. Overland segments still mattered for regional exchange, but they no longer served as the main Eurasian “backbone” for intercontinental commerce. This marks the early modern transition in which the Silk Road’s legacy shifted from a primary trade engine to a historical reference point for earlier Eurasian connectivity.
Decline of overland Silk Road commerce and early modern transitions (15th–18th centuries CE)