To expand the trade into new areas beyond Mongol political control, they encouraged some of their vassals, particularly the South Chinese, to emigrate and set up trading stations in foreign ports. Throughout the rule of the Mongol dynasty, thousands of Chinese left home and sailed off to settle along the coastal communities of Vietnam, Cambodia, the Malay Peninsula, Borneo, Java, and Sumatra. They worked mostly in shipping and trade and as merchants up and down the rivers leading to the ports, but they gradually expanded into other professions as well.
