What makes you think all US companies are like this? A lot of non tech roles were made redundant at my last job, affected people had a 90 day notice and if they stayed the 90 days a hefty severance based on years worked.

My current company does it similar to what you said and gives you time to find a new role or relocate.

The first company I worked for called people into a room and RIFed them out of nowhere. People still got hefty severances.

It’s not a one size fits all approach, start up’s are usually less caring and ruthless with layoffs.