What single change in history would allow to make the German city of Munich be in modern France?

Now in an alternate Earth I would like Munich to be part of the Great French Empire (in the alternate year of 2016 naturally).

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The thoroughness of the explanation
The less far back in time the change needs to happen¹

_{¹e.g. a change around WW2 will be rated higher than a change back in the time of the Empire of Francia}

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What single change in history would allow to make the German city of Munich be in modern France?

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