American and British English are both variants of World English. As such, they are more similar than different, especially with “educated” or “scientific” English. Most divergence can be ascribed to differing national histories and cultural development and the way in which the two national variants have changed correspondingly.
It was said by Sir George Bernard Shaw that “England and America are two countries separated by the same language”.
Written forms of American and British English as found in newspapers and textbooks vary little in their essential features, with only occasional noticeable differences in comparable media.
This kind of formal English, particularly written English, is often called ‘standard English’. It is therefore important for teachers to be aware of the major differences between the two. And while lexical differences are the easiest ones to notice, knowledge of grammatical and phonological differences can be useful not only for teachers to be aware of, but also to be able to deal with in business world. Lack of awareness can lead to embarrassment and confusion.
Another thing which has become apparent is the fact that there are no definitive answers. Not only do different counties/states use different terminology but there appears to be differences between generations as well. All this makes it very difficult to produce information with which everyone agrees.