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In 1292 Kublai Khan launched a thousand ship invasion of Java. His fleet was badly damaged by a typhoon along the way and the weakened force was eventually driven from Java.
What if the invasion was much more successful and Java fell to Kublai? Could we see a Mughal style transformation of the region? Perhaps the Mongols will continue to expand to neighboring islands. With the massive Chinese built fleet and the wealth of Java at their disposal, the Mongols may eventually conquer Sumatra and the Malay peninsula and colonize Australia.
With the end of Mongol rule in China, the southern colonies would become independent. This Java-Khanate would make a very large maritime empire.