Thinking about the word "rubbish" which is widely used in the UK while non-existent in the USA, how do such words surface in Britain but not America?
I read somewhere that American English is closer to British English 300 years ago than British English today itself is. How does one explain this? Did English continue to evolve based on borrowing words from other European languages while America remained isolated? How big a role did British writers/poets that were popular only domestically play? Did technology entrepreneurs coin local words simultaneously (motorway, lorry)? I know there were language steering committees in America in the late 1700s but I doubt they would have abandoned words like "rubbish" for being too obscene as they did for some other words.
I know you can encapsulate the whole chaos in the term "culture" but this seems merely like a sophisticated way of saying "there was no systematic force, it was just chance" which isn't really insight.
Note I'm not focusing on terms that are more common in America than Britain. I'm talking specifically about British-only words.
Other words: autumn, knackered, nappy
EDIT - Those who can't answer but are finding entertainment in this can find more examples here: