Honestly I'm pretty proud of how well turned the ship around on gay rights. Like in the span of a decade there was like a 40% opinion swing on that. We're still not where we need to be and it seems like it's getting worse though tbh. I think Europe overtook us on that front because I feel much safer here in Germany being gay in public.
How (generally) genuinely nice and outgoing everyone is in the states. (Outside of the south where it tends to be a very fake in my experience.) In the states I'm mildly introverted, in Germany I'm usually one of the most outgoing in the room.
Our multicultural foods and stuff. You're never more than a stones throw from really good Mexican, Chinese, Thai, etc. food anywhere in the US.
Turning right on a red light, the European mind cannot comprehend it.
Air Conditioning.
Handicap accessibility.
Our national parks are unparalleled.
Probably a few other American gems I could think of if forced to.
All that being said I'm immigrating to Germany right now and the grass is very much greener over here. I have no desire to live in the US again. I'm definitely not proud of America anymore, but I am proud of a few things about America.