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There are much deeper problems that are undermining the country's ability to blossom again: cultural rot and ethical decay have set in and they are not easily reversed.
That assumes we still have a culture.
As recently as the 1976 Presidential election - Gerald Ford vs. Jimmy Carter - 90% of USA voters had white, mostly northern European ancestors.
According to the most recent (2023) U.S. Census estimates, only about 57% of the USA population has white European ancestors.
The final tipping point, in my opinion, has been the TOTAL neo-Marxist corruption of the Main Stream News Media.