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Indian Ocean Trade Overview

Sep 23, 2025

Overview

This lecture covers the Indian Ocean trade network, its significance, major players, technologies, and the impact of merchants and trade on societies and city-states.

Indian Ocean Trade Network: Structure and Scale

  • The Indian Ocean trade network was a vast system of routes connecting cities across Africa, the Middle East, India, Southeast Asia, and China.
  • It was larger and involved more diverse participants than the Silk Road.
  • Key port cities included Zanzibar, Mogadishu, Hormuz, and Canton.

Role of Monsoons in Trade

  • Monsoon winds are predictable seasonal winds that made Indian Ocean voyages safer and more reliable.
  • Sailors could time trips between Africa and India according to these wind patterns, reducing the risk and cost of trade.

Goods, Participants, and Cultural Exchange

  • A wide range of goods were traded, including ivory, timber, silk, porcelain, cotton cloth, gold, spices, rice, and coffee.
  • African states exported raw materials, while finished goods came from places like China and India.
  • The network included a diverse mix of traders: Africans, Jews, Muslims, Indians, Chinese, and Southeast Asians.
  • Notably, Muslim merchants dominated due to their resources for shipbuilding.
  • Technology such as the magnetic compass, astrolabe, sternpost rudder, and lateen sail spread through this network.
  • Ideas and religions, especially Islam, spread as well, transforming societies such as Indonesia.

Merchants and Power Structures

  • Trade was largely self-regulating and peaceful, with terms set by merchants rather than political rulers.
  • The trade enabled the rise of city-states like Srivijaya and Swahili coast cities, which taxed goods passing through.

Vulnerability of Trade-Based States

  • City-states dependent on trade, like Srivijaya, flourished when trade was strong but declined rapidly when trade routes shifted.
  • Trade-based economies are especially sensitive to changes in global demand, routes, and taxes.

Key Terms & Definitions

  • Monsoon winds — Seasonal winds in the Indian Ocean that enabled predictable and regular maritime trade.
  • Astrolabe — Navigational instrument used to determine latitude by measuring stars.
  • Lateen sail — Triangular sail that allowed ships to sail against the wind.
  • Srivijaya — A powerful merchant city-state in Sumatra that controlled trade through the Strait of Malacca.

Action Items / Next Steps

  • Review the spread of Islam via Indian Ocean trade.
  • Study the technological innovations used in Indian Ocean navigation.
  • Prepare for discussion on the rise and fall of trade-dependent city-states.