I’m looking from a book that I think would have been published in the 80s, maybe very early 90s (I read it in a school library in 1994)

It’s a first-person narrative about a man who was experimentally frozen in modern times and then woken up in the future (100 years maybe). There’s an ostensibly benign non-elected government in charge now and society is divided into worker-classes. He’s a curiosity when he is un-frozen, so is assigned to the highest class of citizen.

Over the course of the book he begins a relationship with a woman and finds out that (surprise) the luxury lifestyles of the upper class are sustained only by terrible exploitation of the lower. He makes plans to escape the country (or maybe just city) but as they’re fleeing he finds out she’s been replaced by an android version of herself (this is how dissenters to the regime are removed). He knows it’s not her because when he holds her hand he can’t feel the scar on her finger.

The only concrete detail I can remember, beyond the scar on the finger, is at one point he is explaining how voting worked to the woman, and he says that even though people at the time complained about politicians, at least everyone had a part in the political process.

Man in modern day is struck by lightning and transported 1000 years back in time to same spot. Survives animal attack but barely. Nursed and mentored by old ancient native american. Man communicates with present day wife through cave writing which is found by archaeologists in present. Archaeologists date writing and find it is authentic but still skeptical as writing is modern English. Man never gets home to present day. Starts new life in past with native american woman. Thank you!