Only due to 2 things:  First, we didn't need to, everyone knew that English was the de-facto language, and you wouldn't get government aid without using english. Right about the time the lawmakers realized this was a problem, they'd allready begun hiring dolts who not only couldn't speak english, but refused to learn it. After that point, "special interest groups" (read, corporate overlords who want cheap labor) started their massive and never-ending hissy fits to prevent English from being set as the official language.