1. The intense income disparity.

2. Healthcare bills.

I suppose these are cliche topics but as a non-american non-tourist the first thing that has stood out to me is that the highs are so incredibly high, and the lows are so incredibly low. Being a Canadian, it's not like we don't also have income disparity...but the gap is not as insane. The rich in the US have yachts that are 100's of millions of dollars, and the poor literally carry their kids on their backs while selling fruit on the side of the highway. You can see both in the same day.

Also I don't think Americans truly understand that you can get weeks of hospital care in Canada and not even receive a bill. Like a month in a private hospital room and i paid for a phone bill, a wifi bill, and some parking fees. In the US if you even so much as flash your eyelashes at a doctor you get a bill for hundreds of dollars.