What event brought seven Catholic cantons of Switzerland together to create a federal constitution?
Sonderbund War: The Sonderbund War (German: "Sonderbundskrieg" ) of November 1847 was a civil war in Switzerland, then still a relatively loose confederacy of cantons (states). Sonderbund War:  It ensued after seven Catholic cantons formed the "Sonderbund" ("separate alliance") in 1845 to protect their interests against a centralization of power.
i don't know