Here is some art I made with culture in mind. The language is
Kwak̓wala (some phrases here). A language that people are trying to save and rediscover some old words.
More and more people speak English, but everyone speaking the same language isn't really a good thing. With loss of language we lose a different view of the world, cultures , identities, history and even knowledge. I am just a humble poet so there are better places for you to read about it.
But even your own use of your language will be part of your identity.
But here are some thoughts on identity:
http://www.bbc.co.uk/languages/yoursay/language_and_identity/endangered_languages/are_we_losing_our_humanity.shtml
And for further reading:
A museum on language in Victoria, BC, Canada you can explore: Royal BC Museum