What year was the modern Swiss Federal Constitution adopted, creating today's federal state?

1848 → dove · roof.

After the brief 1847 Sonderbund civil war, the 1848 Federal Constitution transformed the loose confederation into a modern federal state with a central government, single currency and free internal trade — the Switzerland of today. Peg 18 · 48 → dove · roof: a dove nesting on a roof.

Tip: This is the single most important date in modern Swiss statehood.