The U.S. used to take pride in freedom of movement. In fiction, demands for papers were a classic sign of a government gone over the line. Now you need ID even for a Greyhound or Amtrak. I guess you can still walk or ride a bicycle.
I've taken Amtrak quite a bit in the last few years (Emeryville & Truckee in California, and NYC, Philly, BWI, and DC in the east), and I've never been asked for ID to board a train. (In other words, trivially easy for someone to do something nefarious if they wanted to.)
No security checkpoints, no ticket checking before getting on the train, just someone checking tickets on the train itself 10-20 minutes after it gets moving.
You also don't actually need an ID to fly, though if you try that, give yourself plenty of time to get through "extra security".
And like I said in another reply, the country you grew up in was probably different than the country my still living parents grew up in in the Jim Crow south.
I think I asked what deposit they would need. It had never been an issue before.
"In fact, the TSA does not require, and the law does not authorize the TSA to require, that would-be travelers show any identity documents. According to longstanding practice, people who do not show any identity documents travel by air every day – typically after being required to complete and sign the current version of TSA Form 415 and answer questions about what information is contained in the file about them obtained by the TSA from data broker Accurint…."
https://papersplease.org/wp/2020/05/19/tsa-tries-again-to-im... https://papersplease.org/wp/2024/03/18/buses-trains-and-us-d... https://en.wikipedia.org/wiki/Freedom_of_movement_under_Unit...
Similarly though admittedly more permissive, with Amtrak iirc it's like: you need a credit card and they probably won't check your ID. There were several more years after 9/11 before the "papers please" principle came for the trains and buses too.
E.g. search turned up a claim Greyhound "employees are not allowed to sell a ticket without an official ID" https://travel.stackexchange.com/questions/140703/i-have-no-...
You definitely need ID for hotels a lot of the time. Not sure the level where the regulations are put in place--probably varies--and Europe is probably more formal than the US in this regard. Was staying with a friend in Europe about a year ago and they had to take our passports to the police station to make us "official."
As I wrote elsewhere, I also had a challenge in the US a few years back but I expect that, had I been at my usual chain, there would have been a discussion with the manager followed by "I see nothing, I hear nothing."
ID is not security.
This conversation just doesn't seem promising. Your initial wildly-off claim got me worried I might misunderstand the world by that much (I remember the 70s, fuzzily). I wasted time checking it, wondering if the actual peak might be in a year not mentioned, trying to find the paper Wikipedia cited: it was a non-open-access paper with at least four links to check; one of them did show the first page, which at least gave the figure in question, if not the ultimate source.
I’m sure they both have policies about it on the books, but I’ve never seen them enforced