Freedom of speech is just that; you are free to speak your mind in whatever language you desire, but it should not mean that we can not as a nation make english the official language.
My great great grandparents immigrated to this country about 150 years ago and one of the first things that they wanted to do was learn to speak english, not because they were compelled too, but because they wanted to be a part of this great nation, and speaking english was one of the ways that they could fit in.
There must be some catalyst to bring all people in this country together as one nation, and language can be a very powerful tie. Heck look at us and the Brits we're still on pretty good terms with them even after we had to kick 'em out.
