Standard American English is a misnomer. There is no body or authority which governs any form of standardized form of American English.
Relevant related articles include:
United States
edit- American English, the set of varieties of English spoken in the United States
- General American English, a generalized variety or accent, representing a continuum of natural accents spoken across the United States
Standard English
edit- Standard English, covers the topic of the national norms in major English-speaking countries