Don't forget that it's not just pronunciation diiferences, there are also differences in spelling between American and British English, e.g. color/colour, favor/favour (which have no pronunciation differences) and aluminum/aluminium (which does also change the pronunciation).
I think that there are some very real differences. I remember reading somewhere that one day British and American English would be so different that people from the two countries would no longer be able to converse comfortably. However, I think that that prediction was made in a time prior to the communication age we live in nowadays - I doubt it could happen now.
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