I don't think you realize the situation of the US middle class.

High education costs. High healthcare costs. One serious disease or accident can bankrupt you. Buying a house usually means a 30 years loans at 7% so after 10 years you still have 85% of capital left to pay off.

Salaries are higher but everything is more expensive, so in purchasing power parity it's basically the same.

Yes, I wrote that I prefer Europe