True, but "Future's End" is in 1996, the same year the conflicts ended, and the USA looks the same as it did in reality. I find it hard to believe that if the nation had been under Augment control for at least three years, things would be normal by then.
specifically established that Khan was the "last of the tyrants to be overthrown". He might have been able to stay in power until 1996, but it's possible that whichever Augment was in power in the USA was overthrown well before Voyager
visited Earth in 1996.