This document summarizes some of the key phonological and phonetic differences between Received Pronunciation (RP) English and North American English (NAmEng). It notes that NAmEng has merged some vowel sounds that are distinct in RP, such as /ɒ/ and /ɑː/. It also discusses features of NAmEng such as rhoticity, consonant changes like vocalization of intervocalic /t/ to [d̯], and regional variations within the United States.