British ESL vs American ESL

[optilse]

I do not know but I am here to ask for some insights.

I am a bit confused if there is a difference between British ESL and American ESL. If say, I passed the ESL in Britain, would it be honored in America.

Thanks a lot and hope to read some insights from you guys.

[terence]

The three major differences between between American and British English are:

Pronunciation - differences in both vowel and consonants, as well as stress and intonation
Vocabulary - differences in nouns and verbs, especially phrasal verb usage
Spelling - differences are generally found in certain prefix and suffix forms