In 1353 Bern joined the Swiss Confederacy, becoming one of the eight cantons of the formative period of 1353 to 14<answer>8</answer>1. Bern invaded and conquered Aargau in 1415 and Vaud in 1536, as well as other smaller territories; thereby becoming the largest city-state north of the Alps, by the 1<answer>8</answer>th century comprising most of what is today the canton of Bern and the canton of Vaud.
How many cantons were there between 1353 to 1481?
8