I especially like the very American "I ask that you refrain from discussing your termination with any social contacts made through your membership in the family [...] Failure to comply may result in your severance being terminated early or withheld entirely." In (most of ?) Europe, this severance is law and not debatable (as discovered by Musk recently), so this sentence would be outright illegal. You can talk about…
But it's not a one-way street. Being easier to fire makes American employees easier to hire, which is at least in part responsible for much higher pay in the USA compared to employee havens such as Europe.
Furthermore, Americans tend to pay less tax. This isn't usually thought of as an employee rights issue, but in my mind, keeping more of your money = stronger property rights