A big reason we got to this point in the us is that repeating falsehoods over and over ahead on say fox news convinces a good number of people they are true. We have social media too. It's very successful. The success of this strategy is notable. The propaganda capabilities of today exceed the original electronic propaganda schemes in the early 20th century.

This is a separate question about whether the propaganda methods are spreading correct or false information. I think that's a question with an obvious answer but I'm sure people will differ.