Usually the national government makes sure this doesn't happen. There is no worldwide government that makes sure that national government don't discriminate other nations citizens.
A Zürcher can instantly become a Berner just by moving to Bern, and receiving the rights of a Berner. A Milanesi can get the right's of a Zürcher just by moving to Zürich, he needs to get Swiss citizen to get those rights.
It's a completely different thing.



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