Well-educated Polish modern slaves abroad

nobody.
Most Polish people don't speak properly either. The best Polish speakers are foreigners, because they follow grammmar rules and such.

The English language originated in England. I myself have always wondered why Americans have such a different accent to us.

I say they don't use it properly. For example, [in most cases] Americans don't use Present Perfect, they use Past Simple.

Lee,

The American accent probably comes from the variety of cultures that settled America.

abslotutely true, if I may

True Eurola. I can quote here A.J. Lerner like a example:"There even are places where English completely disappears. In America they haven't used it for years".