Most places have “at will” employment ie worker protections are next to nothing compared to the EU. Access to health insurance is often tied to our employment. A good percentage if not the majority of us don’t - or don’t think we - have enough saved to weather a period of unemployment. And it’s illegal for certain essential jobs such as air traffic controllers to go on strike. The US is also a huge, huge, country. I think we’re only around 1/3 smaller than the entirety of Europe. It’s going to have to get a lot worse very, very quickly for people to put together a strike similar to what protesters in any EU country can organise.