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In my country you also require a valid reason for doing so, you can’t just randomly sack someone
In the US you can be fired at any time for any reason (or no reason), including “I’m having a bad day and I don’t like you.” Randomly sacking people is Trump’s thing, he had a show about it and everything.
So you can get promoted and then fired at any time for 1-2 years afterwards? Sounds like a shit setup. And maybe a way to easily purge people (outside of the Trump nonsense).