I wouldn't say things have evolved, but they have changed, drastically changed, and some of it for the worse, not the better.
I kind of think US society peaked in the 1950's, and has been sliding downhill ever since. Your opinion may vary. But if you look at how folks behaved, the morals and customs have changed for the worse, I think. Folks used to go to church on Sunday, or whatever their faith's holy day was, and learned how to think right, and do right. People would smile, and say "How do you do?" and shake hands when they met. They would hold a door for each other, stand when a woman came into the room, and offer her a chair. They would open the car door for her, and help her in and out of the car. They would watch their language around women and children, takes their hats off when inside, tip their hat to a lady, and put the hat over their heart for the National Anthem, Pledge of Allegiance, or the passing of a funeral procession.
It grieves me, what has happened to my nation. It has gone to hell. Everything is upside down and backward and inside out, now. What was right before is now wrong, and what was wrong before is now right. Our national heroes are now evil villains, and our founding fathers are despicable racists whose memory must be expunged from our history.
If we don't change things soon, this nation is going away forever, and that would be unthinkable to me.