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Well I would still say French would be dominant over Mandarin for several reasons. Technological advantages include current nuclear collaboration on the vast coast of China. China still does not have key infrastructure to self support.

https://www.neimagazine.com/news/newschina-and-france-sign-s...

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A big joint project between China and France does not constitute an argument for learning French in preference to learning Chinese.

Nor does it constitute an argument for learning Chinese, assuming both parties already know English.

The question was "if every Anglophone country sank into the sea, would people learn Mandarin Chinese, or would they learn French instead?"

You seem to be answering some other, unrelated question.

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