What 3 major things would you change, if you could, about America ?

[Spike89]

41. WPA-style programs!

I'd institutionalize those programs, maybe even to the point of semi-required service to society--sort of a draft. I'd also expand it to include much more than just raw physical labor/grunt work. Virtually every job skill would be available and it would serve as an apprenticeship program, infrastructure and operations department, and emergency job bank. The pay would be at least family-wage, and always open (i.e., get laid off from your private job--grab one of these while you look for another if you want).

I'd totally nationalize medicine.

Not just free K-12 education, I'd pay students to attend college (perhaps deferring their semi-required service). So, when some students leave high school and spend the next 4 years learning a trade/skill in the WPA-like program, others may go to college and get comparable pay, but then put those college skills/knowledge to work for society at a "less-than-going-rate" for 4 years. For instance, a doctor might graduate not only without debt, but with some net worth, but rather than getting big bucks right away, they'd get a living wage for the next four years as a payback to society.