Actually, America is one of the oldest continuously operating stable political systems in the world. (UK is older)
For example, the US in its current form is older than China, which was taken over relatively recently by the CCP who are also actively destroying most vestiges of cultural heritage through forced migration and erasing of inconvenient history.
Native tribes are still very much as active as any other cultural group in the modern world. People still speak those languages and pass on the oral history.
Its because mexico is a catholic nation and most things they do are related to that or a synecretic sort of thing with the ancient indigenous religions. If you want to see something similar in the US go to a Little Italy during the feast of the assumption. That is also a catholic event syncretic with old roman religion concepts.
That is part of our culture heritage. People who want to claim the US doesn't have a rich culture are defining culture to exclude all culture in the US which is not fair. It isn't hard to see a lot of culture in the US if you look, but many people want to think there isn't any and so go out of their way not to see it.
Either way, claiming there is less in some other part of the world where families live is just a way to making yourself feel good by tearing someone down. Traditions and culture are different, but that doesn't mean they don't exist or are lesser someplace else.
For example, the US in its current form is older than China, which was taken over relatively recently by the CCP who are also actively destroying most vestiges of cultural heritage through forced migration and erasing of inconvenient history.