This document summarizes some of the key phonological and phonetic differences between Received Pronunciation (RP) English vowels and North American English (NAmEng) vowels. It notes that /ɒ/ corresponds to /ɑ/ in NAmEng, and /æ/ is the same. It also discusses the lack of distinction between /ɒ/ and /ɑ:/ in NAmEng. The document then briefly discusses rhoticity and differences in specific consonant pronunciations between the dialects. Finally, it provides an overview of some regional variations within United States English, focusing on features of Southern accents.