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Between 1898 and 1945 Guangzhouwan, part of the modern city of Zhanjiang, was ruled by the French on a 99 year lease. In 1945 the French agreed to return it to the Nationalists rather than reoccupy it for the remaining 42 years.
Say they don't do that, and like Britain they hold out for the extent of their lease.
Could it, like Hong Kong and Macau be a disproportionately important part of the Chinese economy?
How would the French handle something like the 1966/67 pro-Beijing unrest that Macau and Hong Kong faced? (the Portuguese largely bowed to the leftist demands while the British cracked down hard)
How would having to negotiate with both France and Britain alter the "One Country Two Systems" agreement come 1997?