Ronald Regan eliminated the Fairness Doctrine allowing Fox and other propaganda mouthpieces of the christofascists to broadcast a constant stream of lies until enough of the American public believed it that the christofascists could leverage their seething hatred born out of years of resentment at being made to feel dumb (by the intellectual elites), intolerant (by the woke), backwards (by the progressives), etc. The christofascists leverages the apparatus of the GOP funded by billionaire oligarchs to turn that seething hatred into a willingness to vote against their own self-interest.

I hope this helps you to understand.