What is the difference between British English and American English? Here's a good site that has listings for both dialects http://www.uta.fi/FAST/US1/REF/usgbdiff.html#b2a The list which you request is very long. Have a look here http://en.wikipedia.org/wiki/American_and_British_English_pronunciation_differences

British English was important to learn in the 1800s. American English is important to learn today.

They are both pretty similar. But in British english there are words they use do describe things which differ from American english. For example British english with use the word "mental" where Americans use "crazy" to describe someone who is insane. Also another simple example...British say "Chips" and Americans say "Fries". I can understand my British friends no problem when speaking with them but it's as if we use two different english dialects.

List of words American English gas Petrol jelly jam high school secondary school semester year vacation holiday pants trousers store shop mall shopping centre highway motorway just to name a few. there are also changes in stress such as dicTATor (english) and DICtator ( american) hope that helps :)