In front of a sea of MAGA hats, bedazzled patriotic gear and “Never Surrender” mugshot t-shirts, former President Donald Trump spent nearly two hours at a South Dakota rally in September bemoaning the current state of America. “We are a nation that in many ways has become a joke, and we are a nation that is hostile to liberty, freedom and faith. We are a nation whose economy is collapsing into a cesspool of ruin,” Trump said over a melancholy orchestral tune that played for the final 12 minutes of his speech Sept. 8 at the South Dakota Republican Party’s...