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I'm currently watching a documentary about Daniel Cohn-Bendit, and it turns out that when he was born, his parents considered giving him the French citizenship. In OTL they didn't because they thought they'd soon be moving to the US, and he was officially a stateless person for several years, eventually becoming a German citizen. This enabled the French government to kick him out of the country in 1968. As a result he got involved in German rather than French politics.
Had he been French, he could have stayed in France. What would have been his political career after 1968?