That's just not looking back far enough. The war on terror was a continuation. I'd say we're seeing the results of not stringing up all the slave owners after the Civil War.
American industrialists going back to the robber baron era and beyond have always loved autocracy, specifically fascism. This was heightened by the fear of communism. When FDR was elected, there was an attempted coup (ie the business plot [1]). Hitler was a fan of Henry Ford and named him in Mein Kampf. The Nazi regime enjoyed a certain amount of popularity in the US. There was a rally by the German American Bund in Madison Square Gardens in 1939. But FDR gave concessions to the working class that we still enjoy today (eg Social Security).
After WW2, we decided to make an enemy of Stalin (again, because communism). Thousands of former Nazis emigrated to the US (and, no, not just Operation Paper Clip; they were also in the CIA and FBI). Former Nazis gained high positions in the West German military and ultimatly NATO (eg Adolf Heuzinger [2]).
The mere existence of the Soviet Union forced the US government to give more concessions to the working class. The 1950s were incredibly prosperous as a result, in an era when the top marginal tax rate was 91% and the ratio of CEO to median wage was a fraction of what it is now.
The Fall of the Soviet Union was about the worst thing that could happen for normal Americans because suddenly there was no counterbalance to US global hegemony. The 1990s saw the Democrats abandon the New Deal in favor of Reagan economics and policies despite ~60 years of almost unbroken control of Congress up until that point. They then sowed the seeds for the destruction of American manufacturing and having an economy completely focused on hoarding land and housing. The 1990s is really where that began to go out of control.
My point is that history didn't begin with the war on terror. 9/11 itself was blowback from American imperialism that had been around since the 19th century.
I'd say if anything primed America for autocracy it was the domino effect from desegregation. This led to the political activation of the evangelical movement (no, it wasn't abortion) and evagelicals are primed to be followers. Add to this that there's no effective opposition because the Democrats decided to be Republican Lite and here we are.
All of this came about because a handful of very wealthy people wanted to be even wealthier at the expense of everyone else.
[1]: https://en.wikipedia.org/wiki/Business_Plot
[2]: https://en.wikipedia.org/wiki/Adolf_Heusinger