When you wrote that as Brazilian "we can live" in certain countries I think that you were actually suggesting that we could "survive" or we would speak enough to "survive" in day to day situations.

Then going back to the subject line you ask if Americans are afraid of the growth of English speakers. Why would any people in the world get afraid of the fact that their language gets more and more accepted and popular by the day?

You forget England and the whole United Kingdom, Australia, New Zealand, and Canada.

Do you agree that just because we speak a language or the language it doesn't mean we can live in another country because to live in another country we must have a permit that allows us to live there?