It is indeed possible for a nation to exist peacefully if people within its borders speak different languages so long as there is a central language spoken.
How can people who speak different languages live peacefully?
Language is a means by which people can communicate and if people are unable to communicate, they won't be able to live peacefully.
This is why there should be a central language in a nation that all people can communicate with. These people can then have their own tribal languages and still coexist with others.
In conclusion, it is possible if there is a central language.
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