I'm biased (I'm European), but I'd much rather be middle class in Europe than in USA.
I'm biased as well, being American. I think I'd much rather be middle class in Europe than the USA as well. Middle class in the US is a constant feeling of the ladder dissolving just beneath you.
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.
I'd much rather the people of every continent have the combined technology advancements of three major powers vs two.
Do you realize the variety of breakfast cereals you are giving up?
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The US is biased to favor the top half of society. Hence why there is a lot of vocal poorer people and a lot of low profile wealthier people (I'm not including the 1% or even the 5% in this).
When you are in the 75%ish of the US, it's very easy to make a case that life in the US is better. But we don't really talk about that because it's pretty taboo when poorer people are struggling much more than they would in Europe.