Switzerland became multi-linguistic systematically from 1958 to 1990.

The geography of Switzerland makes it too hard to conquer.
He chose to major in geography in the university.

Hans Kurath has written:

'Handbook of the linguistic geography of New England'

Read....than you will know

Linguistic pluralism refers to the coexistence of multiple languages in a society or community. Examples of linguistic pluralism can be seen in countries like Switzerland, Canada, and India, where multiple languages are officially recognized and used in various aspects of public life, such as education, government, and media.