Some advantage of culture preservation (Score 1)

I read most of the comments here, and I would like to show some advantages of preserving a language. I can tell I am a French-Canadian. Others are French, Germans, Americans, etc etc etc. I see a huge advantage for cultural diversity: I creates many differents points of view. It becomes harder for an Empire to spread their power when they face diversity. For french-canadian, french language is a strong protection from american economic, cultural, political invasion. I dont mean American culture is bad, not at all. I mean that I am part of another culture which helps maintain diversity. For scientific documents, and stuff like that, it is great to share one common language (English). But when you think of stuff like media coverage, I think language barrier helps keeping different points of view.