One of the things that has always impressed me about the United States of America is that, unlike most nations, it is not a mono-culture. There are many wonderful nations out there, like France, or Sweden, or Italy, or Japan, but most of them tend to be dominated by a single relatively homogeneous cultural norm.
In contrast, the United States benefits from its history as a nation of immigrants. In everything from our humor, our cuisine, our interior design, our shops, our street fairs, and many more things besides, our culture is enriched by influences from many nations.
Simply walking down the street in New York City feels like visiting a cross between the United Nations and Disney’s EPCOT. The diversity on display is mind-bogglingly rich.
So it would be fair to say that one of the key things that makes America great is its profoundly rich diversity. More tomorrow.
America is dominated by cultural norms – see this old Tom Scott video, particularly the section about the playground game at 9 mins:
https://m.youtube.com/watch?v=V5u9JSnAAU4
But not a single cultural norm. Many different cultural norms.