It’s not even close to being in the top 100. The U.S. is, however, the second-fastest growing country in North America. That might be cause for alarm… but seriously, if you exclude immigration, the population is barely growing at all.
The U.S. may consume too many resources, but there’s no question it could hold a lot more people. Are you going to tell me that Alaska, Wyoming, and Montana are overcrowded?
But back to the OP: tolerance for people of different races and sexualities might be surprising, and it’s kind of a given that changes in manners would be a surprise. But one kind of tolerance hasn’t been remarked on, and that’s our tolerance for mental illness. You see public service announcements about suicide and depression, and very large numbers of people are on antidepressants or in therapy, or both, and for a lot of people, that’s not seen as a big deal.
A person from 1959 might be very surprised about our health. Most people are on at least one prescription drug for something, if not several. It’s not even something you blink at these days. They might be surprised that most of us, including a lot of children, are overweight, and more and more people are developing diabetes as a result. Again, they might be surprised to see that affecting kids. We’re much more successful at treating things like heart diseases and cancer, but a lot of those things haven’t been cured in a significant way.
Did nobody mention that we buy bottled water now? They might be surprised that became fashionable. A lot of other ‘little’ extravagances might be a shock.
And I think they would definitely be surprised about inflation. I think that applies most to how much money we spend on entertainment and food. People today are staggered by the salaries athletes and CEOs and so on - if you came to 2009 straight from 1959 that would be a lot worse.
Some of them might be pleasantly surprised that fluoridation wasn’t a Communist plot, and did a lot of good for kids’ teeth.