sentences:  Swiss citizenship is still primarily citizenship in one of the Swiss cantons, and the naturalization of foreign citizens is the privilege of the cantons.No Swiss passports were issued prior to 1915, more than 60 years after the establishment of the modern Swiss Confederation.Prior to 1915, citizens held passports issued by their cantons, the Confederation being considered as a federation of the cantons, not a state composed of natural persons as its citizens.