There is actually a great many things in Spanish already. If you look at any government thing there is always Spanish writing whenever there is English and most things have instructions in Spanish, and a lot of projects have Spanish labels. At least there is how it is where I live. The US has no official language but if it did Spanish would probably be listed right after English.
Indeed for. For almost all 50 states the second most widely spoken is Spanish with the small exceptions being Louisiana with French and the Dakotas with German.