The US has enjoyed amazing prosperity, but it was squandered by allowing the majority to only go to the 1% instead of spreading it around through programs like universal healthcare and free education. Thinking that workers would still be working if it just wasn't for globalization is completely ignoring automation. Add in that very few people want to do work that is long and dangerous, and it made sense to send it elsewhere and move up the value chain.

  In today's world, capital interests use thinly veiled slave labor while passing on very little of the economic pie to American workers.

Exactly, and we will find out very shortly whether going isolationist cures that.

Globalisation is about comparative advantage.

Some of America’s comparative advantages that we see a lot of on HN has been designing chips, online services and financial services etc. Also the defence industrial complex. There are probably more.

In general todays Americans don’t want to work in factories any more, and factory owners don’t want workers these days either: they want robots. Witness all Musk has said about workers being temporary while he gets robots at Tesla since the start etc.