list of languages spoken in United States:
An official regional language is a language that is given a special legal status in a particular region in the country.
De facto official Language is a language "in practice but not necessarily ordained by law".
According to the The Unicode Consortium the overall literacy rate (The ability to read and write) in United States is 99%.
More information about languages spoken in United States (see links):
Information links (Principal Languages, Immigrant Languages, Language Counts, etc.) about Languages spoken within United States - See link
A complete United States's languages summaries - See link
Map showing the locations of languages in United States - See link