Spent a lot of the 90’s living and working in the States, as with any culture its different, same as with my time spent in Japan and now Hong Kong/Singapore.
They like to talk a good talk, some of them actually back this up, say 75%
Most from the East and West coasts get UK humour and sarcasm
They have corporate jargonists just like we do
They do work hard and have lousy holiday allowance (Asians pretend they do but have a ridiculous amount of national holidays)
There is a definite class system as pointed out above, your either doing well or really trying to do well
I should also add that in the States, and I feel this in Asia also, there is a sense that if you work hard and try you will succeed, something I have never felt in the UK.