HEre, we have many many people that take english - not as a foreign language but as a SECOND language. Hence the term ESL, English as a Second LAnguage.
Though I think you're probably right.
There seem to to be a lot of things wrong with the way in which we view languages.
The more languages I learn, the more I'm able to communicate in any of them because I have a better understanding of language itself independant of one particular language.
Anglos don't take "SSL" Spanish as a Second Language, yet here in deep south Texas, the incoming Mexican immigrants take ESL.
Our colleges and some high schools do offer ASL as a language course, but I don't know if the requirements refer to it as a "foreign" language.
Maybe that's just a technicality, but then again technicalities keep murderers out of prisons.