Question: What year did the country, in which Ambrosius Blarer was known as an influential reformer, become a federal state of relatively autonomous cantons?
Sentence (from "History of Switzerland"): Since 1848, the Swiss Confederation has been a federal state of relatively autonomous cantons, some of which have a history of confederacy that goes back more than 700 years, putting them among the world's oldest surviving republics.
Relevant evidence: Yes