Networks of Exchange (c. 1200–1450)
What you must know
The 1200–1450 period is defined by expanding exchange across three linked arenas. On the Silk Roads, the Mongol Empire's pax mongolica lowered the cost of overland travel: caravanserai, standardized weights and paper money moved goods, technologies (gunpowder, printing, the compass), religions and diseases between China, Central Asia, the Islamic world and Europe. Indian Ocean trade ran on the monsoon wind cycle, linking Swahili ports like Kilwa, Arabian entrepôts, Gujarati merchants and Malacca; lateen sails, the sternpost rudder, the astrolabe and improved cartography lowered risk, while diaspora communities settled in port cities. Trans-Saharan trade in gold, salt and enslaved people connected Mali and the Maghreb. Commercial institutions - bills of exchange, credit, partnerships, insurance - grew because long-distance trade needed trust across distance. Cultural diffusion followed the routes: Buddhism to East Asia, Islam and Sufism into Africa and South Asia, and the Black Death across Eurasia, killing perhaps a third or more of affected populations and, in Europe, eventually raising wages by thinning the labor supply.
Traps
Resist the "Mongols as simply destructive" framing - their destruction was real, but they also enabled exchange and eventually assimilated. Do not say the Mongols ruled Western Europe; they reached Hungary in 1241 but withdrew. Do not treat the Silk Roads as carrying one good; they moved ideas, people and pathogens. Be careful with the Black Death: it devastated populations, yet its economic effects were not uniformly negative. And distinguish Indian Ocean trade (bulk goods plus luxuries, merchant-driven) from land routes (high-value luxuries, more state-dependent).
Worked example
For any trade question, build a three-part answer: geography (monsoon, steppe, desert), technology (camel saddles, dhow, compass) and diffusion (religion, crops like sugar and cotton, plague). If the question asks about change, ask whether the route grew or was displaced.