Ask HN: As a European, what should I expect working for an American company?

I'm a western European software developer who is receiving offers from US companies, likely due to the recently increased acceptance of remote work.

Since I'm considering those offers, I'm curious about the differences in work culture. I'm particularly interested in the experiences of Europeans who have worked for American companies, and viceversa.

I'm asking in the broadest of senses, so anything goes, from benefits through work politics to dos and don'ts.