The things that made America so wealthy were changed pre-2000. It takes time for those changes to really impact society, and for people to realize it. And no one really talking about "fundamental" change. They're talking about raising taxes back to what they used to be like in the 60s and 70s. Not just in terms of the rate, but the percentage of the tax burden that falls on each segment of society.
1) There is a tendency to focus on the negative
2) The general trend of wealth inequality has been going in the wrong direction for many, many years and it is only getting worse
https://en.wikipedia.org/wiki/Wealth_inequality_in_the_Unite...
US prosperity is largely a function of imperialism and military might, not some magical economic formula.
For instance, in South America:
https://en.wikipedia.org/wiki/United_States_involvement_in_r...
The US government overthrew a democratically elected government for the prosperity of a _fruit company_.
> all it seems anyone talks about is how to fundamentally change the systems that made it that way.
Many of the people are fighting the systems that have heavily exploited poor countries around the world for the last ~100 years because they see it as fundamentally immoral. The US doesn't _deserve_ the standard of living it has achieved, and it's built on the blood of dead South Americans and Middle Eastern people.
It's honestly pathetic that poor Americans aren't provided for given the absolute spoils of war the elite have enjoyed.
The USSR was imperialist, and did achieve massive increases to the standard of living of the elite through imperialism. It's much easier to feed Russia when you can starve Ukraine.
Colonial Britain and the Dutch East India company both achieved massive gains in wealth through imperialism.
The only argument you've made is that strong property and contract rights with rule of law and low corruption can prevent squandering the spoils of imperialism. I'm not sure if I agree with that, we're too early into the US's age of dominance to tell, but it's adjacent to my point.