"How could all this happen? How could (neo) fascism rise and take over US domestic and US foreign policy ?"
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Well, it's simple. The Mind Software of the West was a fusion of Roman imperial ideology and bloody fantasy pamphlets where a big rag doll in hands of Aramaic ventriloquists says: - I have chosen you for the Domination of "the people of the land" of "the land of Canaan".
The Romans said: - Domination, extermination, mass killings with a strong genocidal impulse, OMG, This is clearly the true religion, and we just need to make a small adjustment: where the bloody pamphlets says 'land,' we put '(planet) earth'.
This old fusion has been reissued many times in the West until the last version encouraged by Zionist fascism. In other words, it has been a two-way street.