A lesson from Switzerland's Multi-lingualism

Though small kid Disney Slide in size, Switzerland has four official languages. These languages are spoken by four different European ethnic groups in separate areas in the country. The distribution of the different languages in 1990 was: German 65%, French 18%, Italian 10%, Romansh 1% and others 6%.
瑞士国家虽小，却有四种不同的官方语言。这四种语言的使用分布在不同的地区内，由四种属于欧洲的语言族群组成。语言的使用率在1990年是：德语65%，法语18%，意语10%，罗曼斯语1%，其他6%。

The four main ethnic groups live in 25 cantons, all of which enjoy a high degree of autonomy, especially in the areas of language and cultural policies. Thus, the teaching of language is not uniform throughout the country, there are variations among the different cantons.
这四个语言族群，分居在25个州内，每州都有相当大的自主权，尤其是有关语言与文化政策的制定。因此，语文教学制度不是统一的，各州的制度都有差异点。

What is amazing is that the Swiss people, made up of different linguistic and racial groups, have been able to live in harmony and share a common national identity. This extraordinary achievement has been praised, admired and hailed as a model for racial harmony by many countries, including Singapore. These different races with diverse cultures and histories have been able to live together in a country without any clashes and have, for 700 years since independence, made their country wealthy. What is their secret?