AP World Unit 2 Review: Networks of Exchange (1200-1450)

The Silk Roads were overland and maritime routes connecting China, Central Asia, the Middle East, and Europe. After 1200, improved commercial practices and transportation technologies increased trade volume and expanded the geographic range of these routes. Demand for luxury goods across Afro-Eurasia drove production of Chinese textiles, porcelain, and iron and steel, as well as Persian and Indian goods. Trading cities like Kashgar and Samarkand grew as key nodes on these routes.

• Caravanserai: Inns spaced along overland routes that provided lodging, food, and security for merchants and their animals, making long-distance travel more reliable.
• Bills of exchange: Written financial instruments allowing merchants to conduct transactions without carrying large amounts of coin, reducing the risk of robbery on long routes.
• Paper money: Currency issued in paper form, first developed in China, that facilitated commerce and supported the development of money economies along the Silk Roads.
• Luxury goods: High-value, low-bulk items such as silk, porcelain, and spices that were the primary commodities driving long-distance trade demand across Afro-Eurasia.
• Kashgar and Samarkand: Major trading cities that grew wealthy as crossroads on the Silk Roads, illustrating how trade routes generated urban growth.

The Mongol Empire, founded by Chinggis Khan in 1206, became the largest contiguous land empire in history. After Chinggis Khan's death it fragmented into four khanates: the Yuan Dynasty in China, the Ilkhanate in Persia, the Golden Horde in Russia, and the Chagatai Khanate in Central Asia. Despite fragmentation, the Mongols facilitated Afro-Eurasian trade and communication by drawing conquered peoples into their trade networks and maintaining the Pax Mongolica, a period of relative stability that made Silk Road travel safer. The Mongols also enabled major technological and cultural transfers across Eurasia.

• Pax Mongolica: The period of relative peace across the Mongol Empire during the 13th and 14th centuries that made long-distance trade and travel safer and more frequent.
• Khanates: The four successor states of the Mongol Empire (Yuan, Ilkhanate, Golden Horde, Chagatai) that continued to facilitate regional trade after the empire fragmented.
• Greco-Islamic medical knowledge: Medical theories synthesized from Greek and Islamic traditions that were transferred to western Europe through Mongol-era interregional contact.
• Uyghur script: A writing system adopted by the Mongols for administrative purposes, illustrating how conquest led to cultural borrowing.
• Numbering systems: Hindu-Arabic numerals and mathematical methods transferred to Europe through Mongol-era trade and contact networks.

The Indian Ocean trade network was a maritime system connecting East Africa, the Arabian Peninsula, South Asia, Southeast Asia, and East Asia. Knowledge of the monsoon winds was essential: merchants sailed northeast in summer and southwest in winter, making predictable round trips possible. Improved navigation tools and ship designs increased the volume and reach of trade. Diasporic merchant communities settled at key ports, blending their own cultural traditions with local ones. The Ming admiral Zheng He led seven major voyages across the Indian Ocean between 1405 and 1433, demonstrating Chinese maritime capacity and establishing diplomatic and trade relationships.

• Monsoon winds: Seasonal winds that reversed direction twice a year, enabling predictable sailing schedules across the Indian Ocean and making long-distance maritime trade practical.
• Compass and astrolabe: Navigation instruments that allowed sailors to determine direction and latitude, increasing the safety and range of Indian Ocean voyages.
• Swahili Coast city-states: Independent trading cities such as Kilwa along the East African coast that grew wealthy as nodes in the Indian Ocean network, exchanging gold and ivory for Asian goods.
• Diasporic communities: Settlements of Arab, Persian, Chinese, and Malay merchants at key ports who introduced their cultural traditions while also absorbing local practices.
• Zheng He: Ming Dynasty admiral whose seven voyages (1405-1433) across the Indian Ocean expanded Chinese trade relationships and demonstrated the reach of maritime technology.

Trans-Saharan trade connected West Africa to North Africa and the wider Afro-Eurasian world. The key innovation enabling desert crossings was the improved camel saddle, which allowed camels to carry heavier loads more efficiently. Organized caravans provided safety and logistical support for merchants crossing the Sahara. The Mali Empire grew powerful by taxing and controlling the flow of gold and salt across these routes. Islam spread into West Africa largely through the commercial networks and the merchants and scholars who traveled them. Cities like Timbuktu became centers of both trade and Islamic learning.

• Camel saddle: An improved harness design that allowed camels to carry heavier loads across the Sahara, making trans-Saharan trade more efficient and profitable.
• Caravans: Organized groups of merchants traveling together across the Sahara for safety and logistical efficiency, the primary mode of trans-Saharan commerce.
• Mali Empire: A powerful West African empire that controlled trans-Saharan gold and salt trade, grew wealthy from taxing caravans, and spread Islamic culture through rulers like Mansa Musa.
• Timbuktu: A major city in Mali that served as both a commercial hub on the trans-Saharan routes and a center of Islamic scholarship and learning.
• Spread of Islam: Islam expanded into sub-Saharan West Africa primarily through trans-Saharan trade networks, carried by Muslim merchants and scholars.

Increased cross-cultural interaction through trade networks produced significant cultural diffusion across Afro-Eurasia. Religions spread along trade routes: Buddhism influenced East Asia and spread into Southeast Asia, while Islam expanded into sub-Saharan Africa and South and Southeast Asia. Technologies also diffused: gunpowder and paper both originated in China and spread westward. Cities experienced uneven fates, with some growing dramatically from trade while others declined. As networks intensified, travelers produced written accounts that documented the connected world. Ibn Battuta, Marco Polo, and Margery Kempe are the key illustrative examples of this travel writing tradition.

• Ibn Battuta: A 14th-century Moroccan scholar who traveled over 75,000 miles across the Islamic world and beyond, producing a detailed account of trade cities, cultures, and Islamic communities.
• Marco Polo: A Venetian merchant who traveled to China in the late 13th century and recorded observations of the Mongol court and Silk Road trade, influencing European knowledge of Asia.
• Buddhism in East Asia: The continued influence and spread of Buddhist religious and philosophical traditions through East and Southeast Asia, facilitated by trade network contact.
• Paper: A Chinese invention that spread westward through trade networks, enabling the diffusion of knowledge, administration, and communication across Afro-Eurasia.
• Diffusion: The process by which cultural practices, technologies, and ideas spread from one society to another through trade, migration, or conquest.

Trade networks moved more than goods and ideas: they also carried crops and pathogens. Crop diffusion generally improved food supplies and supported population growth. Bananas spread into Africa, new rice varieties reached East Asia, and citrus spread across the Mediterranean. The same routes that carried luxury goods also carried the bubonic plague, which traveled along Silk Road and Indian Ocean routes in the 14th century, killing tens of millions across Afro-Eurasia. The Black Death is the most significant environmental consequence of trade connectivity in this period.

• Bubonic plague: A deadly infectious disease spread by fleas on rats that traveled along Silk Road and Indian Ocean trade routes in the 14th century, causing massive population loss across Afro-Eurasia.
• Biological diffusion: The spread of plants, animals, and diseases across regions through trade networks and human movement, producing both beneficial and devastating consequences.
• Champa rice: A fast-maturing, drought-resistant rice variety that spread through East Asia via trade networks, increasing agricultural productivity and supporting population growth.

Topic 2.7 asks you to compare the Silk Roads, Indian Ocean network, and trans-Saharan routes directly. All three expanded after 1200 because of improved commercial practices and rising demand for luxury goods. All three spread religions, technologies, and cultural practices. But they differed in terrain and technology, the goods they primarily carried, the regions they connected, and the states that grew from them. Knowing these similarities and differences is essential for SAQ part C responses and LEQ comparison prompts.

• Commercial practices: Methods of conducting trade such as bills of exchange, caravanserai, and organized caravans that were shared across multiple networks and drove expansion.
• Interregional trade: Exchange of goods, ideas, and cultures between distant regions, the defining feature of all three major networks in this unit.