For wherever this discussion is meant to go, the fact is that the U.S. does not have an official language. As a practical matter, one has to have a very basic facility with American English, but actually speaking it well, or at all, is not formally required. (Reading posts on USMB is all one needs to see that is so.)
Businesses are well served to attempt to offer Spanish speakers a convenient mode of access for purchasing their goods and services. According to the Census Bureau, some 41M native Spanish speakers live in the U.S. If a business' choice is to communicate in Spanish or not earn revenue from Spanish speakers because they don't understand English well enough to exchange resources with an English-only business, offering prompts in Spanish is likely worth it. That said, there are plenty of businesses that don't offer bilingual telephone prompts. My doctor's practice is one such example. My firm also doesn't proactively offer non-English, but if we are approached by a potential client who has poor command of English, we'll find a way to communicate with them in their language.
As for major governmental writings that one daily encounters, I can't think of any that I've come by and that are written bilingually, though I know there are some. The sign below is from Port Angeles, WA.
