"People are poor for primarily one reason - because they made bad decisions. " - so how does that explain the cratering of the birthrate among those who can afford kids: middle-class and upper-middle-class Americans?

Well this will be a pretty easy intelligence test for Trump. Make a few billions from selling soybeans, but give up Taiwan with TSMC and its world-leading chip fab, basically throwing in the towel on the "everything" race (AI, Robotics, Mil, etc.).