Unless you work for government, in which point once you make it through your year you are damn near minted. But the highest positions like my boss and on up are all at will employees. So they can be fired for no cause and election time can be interesting.I had two works council reps working For me in my unit, oh joy. The Mrs had Germany, along with most of the rest of europe under her HR wing. Whilst she will tell you that Germany is difficult she would tell you that Italy is worse.
The US tends to be at will contracts so you can be out of the door at the whim of your boss. They better have a good reason though cos you can sue their arrses and receive a nice payout. Climb the ladder and you can negotiate your minimum termination package When you initially sign on. I know my Mrs has always had at least 6 months total package, including bonus, in her jobs here - damn fine if you get laid off and walk into another job a fortnight later.
i am still amazed though how many supposedly hard charging, super negotiating Americans have no financial plan in place. Some seem to actively mis-manage their finances, regularly re-mortgage their homes, take loans for everything and borrow against their 401K (thats their pension pot). Then as a result they have to work till they drop some time in their 70’s if they live that long.