Personally, I see Trump as a symptom, no much cause.
In the same sense Bush II was the result of Clinton, and Obama was the result of Bush II, Trump I was the normal backlash against Obama's overreach. Think about what it means that Trump - a pretty poor president the FIRST time - was selected a SECOND time by a majority of Americans?
Biden's admin was seen as so grossly partisan, so sclerotic that every single demographic except white women swung rightward.
(Some of us might suggest that the vote was ultimately cultural, not political; an instinctive revulsion at the Left's very Gramsci-an post-covid victorylap/overreach into even redefining reality - what is a woman, indeed?)
The result is militant ossification on the left in turn. The centrists have no voice. I'm not sure there are many actual centrists left.
Corporate media is no longer an oppositional 4th estate; they've picked a side. (They're oppositional NOW because their side is out of power. That's contextual not fundamental.) I *much* prefer a media that tears apart everything a president does than the craven lickspittles running cover for the wealthy and powerful.
I saw an anti-ICE post the other day "Eisenhower deported 1.3 million illegal immigrants with only 750 agents"
Yes that's because in 1950, the statement "Illegals should be deported" would rank up there with "The sun rises in the East" and "Water is wet" as so obvious NOBODY would have disagreed.
Yet - many of the tactics Trump's floating today about countering the Supremes' ruling against his tariff were first employed by Mr Obama. His administration had one of the lowest Supreme Court win rates for a modern presidency (~50%) - the lowest since Zachary Taylor with a notably high number of 9-0 losses, totaling nearly 50 over his two terms.