This is what I have. I don't know maybe you are right but what I have been studied in phonitics told me that there are two major accents in IPA for native English.
see also
History of British vs American English
http://www.diffen.com/difference/Ame...ritish_English
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if I brought a website that contains differences and similarities between Saudian & Egyptian accents .. does that mean there're only 2 accents in Arabic??a