But why do you make wrong statements?
While French or German speakers in Switzerland works,
It didn't work between Germany and France between you know 1810 and 1945. If you grow up in Germany and France this would not be a surprise.
Europe had lots of problems in the past (and usually people learn them in high school). You deny them just because of migration which both happen to be starting in the Germanys and France way earlier before the last 20 years (and also the discussions!). This also a known fact for people who care about these countries.
And this is JUST Germany and France. This is not Europe.
If you curious about European or German history start the Wikipedia article , visit the countries instead of following American far right twitter accounts about migration.