What about the languages that were spoken before Europeans invaded America? Should we preserve them?
Puerto Rico is part of the US.
What about all the business that American companies do overseas in countries that do not speak English? People passing down their rich cultural heritage, including languages other than English, is something that benefits everyone.
I am proud of my cultural heritage, even if I am not proud of some things that both the country in which I live and the country from which most of my ancestors came.
Jeff