Firstly to survive a language must evolve, and the Americans are English users and are just as entitled to add new words or alter meanings as we are. Secondly as Des Irate says above a lot of the time the Americans 'talk better than what we do'. They've preserved several old English words such as 'Fall' for Autumn and 'gotten' as part of the past tense of the verg 'to get'. They also preserved the long 'rrrr' sound in words such as 'beer' and 'fear' which largely disappeared in England in the 18th century when the Dandies thought it refined to clip their speech.Adriodinho said:Does it piss you off that they have to convert the English language and change it how they please?
It really gets on my tits, as if they cannot speak properly.
Here is an example of American commentry in the World Cup. They use 'One to nothing' instead of 'One nil'
http://www.youtube.com/watch?v=7KkIQOS-D2I
However you're not alone in your futile rage. In the 19th century people moaned at Charles Dickens (who'd travelled extensively in the USA) for peppering his conversation with dreadful Americanisms such as 'lengthy' and 'influential'. And in 1917, much to the chagrin of the British high command in France, British troops learnt a whole new load of really cool terms of abuse from the newly-arrived American soldiers who were apt to refer to the Germans as "those motherf**king c**ksuckers!"