I am torn. ONE thing?
Wow.
Can I just think-out-loud about some possible choices?
...I would ask the framers of the constitution to be more-specific. I would help them understand the unforeseen BULLSHIT we face today.
...I would Convince my dad to do what he had to do to buy a split-window corvette, 427 Cobra, and a 1964 1/2 Mustang. Then garage them. Store them properly. That would make America better because I'd be rich.
...here's the rub with all this - Nothing that has been done can be undone because it's already happened. Impossible.
“… the greatest detractor from high performance is fear: fear that you are not prepared, fear that you are in over your head, fear that you are not worthy, and ultimately, fear of failure. If you can eliminate that fear—not through arrogance or just wishing difficulties away, but through hard work and preparation—you will put yourself in an incredibly powerful position to take on the challenges you face" - Pete Carroll.