An American English speaker is more likely to say "I've just seen her" whereas a British English speaker is more likely to say "I just saw her".

American English is a simplified variety of British English.

Most American English accents have an audible 'r' sound at the end of syllables whereas most British English accents don't.

When Americans want to wash their hands, they open a 'faucet', whereas British people open a 'tap'.

An American who wants to access the engine of their car will open the 'hood', whereas a British person will open the 'bonnet'.

The Puritans were determined to preserve the 'purity' of English because it was the language of their Bible.

American English changed more significantly in the 17th-20th centuries than British English.

An American English speaker is more likely to say "I insist that she be there tomorrow" whereas a British English speaker is more likely to say "I insist she should be there tomorrow"

In most American accents, intervocalic /t/ is pronounced the same as in British RP.