One of the issues with pre-modern trade is that international banking and communication as we understand it did not exist, and trust was a major problem across distance and time. This is why dispersed ethno-religious groups could be the vectors by which private trade occurred between civilizations, because there was a circle of trust which existed between these groups despite their particular residence. Jews are the most famous cases of this, but the pre-Islamic Silk Road saw a similar phenomenon with the Sogdians. In the modern world various ethno-religious groups from Gujarat whose traditional occupation is trade also maintain this link to the past of international commerce, which was embedded in kin and religious networks, not transnational corporate institutions.
A major way to establish fellow feeling and trust is religion. The Islamic scholar and traveler Ibn Battuta trekked from his native Morocco across the world of Islam, all the way to China. Notably throughout his travels he remained within the confines of a predominantly Muslim subculture. This made sense in regions where Islam was the religion of the majority, or of the minority which was in power (India), but even in China he found refuge among that region’s Islamic community (the presence of Muslims was important, because he could always offer up his services as an Islamic legal expert, though in some cases he was obviously drafted into the role). Ibn Battuta flourished in the 14th century, when Islam may have been ceding ground to Western Christendom (e.g., in Spain), but was waxing in the east, and in particular the Indian ocean basin. Already regions of maritime Southeast Asia such as Aceh were Muslim, and within the next three centuries all of what is today Indonesia would come under sway of rulers who were professing Muslims (with the minor exception of Bali).
How did this happen? This became the subject of discussion below. There aren’t any hard & fast answers here. Much of what I know is from a few books, After Tamerlane: The Rise and Fall of Global Empires, 1400-2000, Power and Plenty: Trade, War, and the World Economy in the Second Millennium, and A Splendid Exchange: How Trade Shaped the World. In none of these books is the Indian ocean trade network the center of the narrative, but all of them focus on its evolution. In particular, with the rise of the Portuguese in the 16th century we get a sense that in that period the Indian ocean was for all practical purposes a Muslim sea! Granted, the peoples who inhabited the shores were not necessarily Muslim, but from the European (and also earlier Chinese) perspective the trade seems to have been captured by peoples who professed Islam. In this lay the possible answer for why maritime Southeast Asia became Muslim, while mainland Southeast Asia did not. The main exception in the latter case are the Chams, a people who happen to be Malay, and so were intimately connected with maritime Southeast Asia.

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