What are you talking about? Tripe is a bog standard ingredient in Mexican cuisine seen on every menu from the southern tip of Mexico to Toronto. It’s the basis for sausages and hot dogs, an American staple. You can buy offal at almost any supermarket. Why would they carry it if people in North America didn’t see it as food?
The reason most Americans don’t eat it is better options. Like rib eye steak and a salad.
You can also buy multiple forms of seaweed at Costco and Walmart. That’s about as North American as it gets.
Sorry, but you can't buy all offal in most American supermarkets.
Living in NYC, where you can get both tripe and liver easily - you have to go to "ethnic" stores to get heart, kidneys or lungs. (I have yet to see any lungs or intestines in any US store... and I mean ANY. I'd have to go to a butcher and order small intestines to make sausages.)
As for seaweed - it's primarily dried Japanese style seaweed that we can get in Costco's around NYC.
You know which socio-cultural group I am talking about and it's not Mexicans. Sausage casings are also overwhelmingly synthetic especially for mass manufactured hotdogs.
Premium cuts became "better options" because of hyperindustrialization, which made those cuts more affordable than before. This is a point you raised yourself in an earlier comment.
The only reason you can buy seaweed at Costco and Walmart is because of multicultural immigrants and globalization, which are starting to undo the hyperindustrialization of the food industry even if by just a little bit.
The reason most Americans don’t eat it is better options. Like rib eye steak and a salad.
You can also buy multiple forms of seaweed at Costco and Walmart. That’s about as North American as it gets.