It's crazy how nothing has been done in the US about this. I got an egg allergy in my late 20s, I had never thought about it before and now eating at restaurants is such a hassle. Even the delivery apps seem to have zero affordances for food allergies, at least with a restaurant you can get some assurance by asking the staff.
You might like the UK. The place is wall to wall with allergen lists.
I’m very sorry to hear that, but I don’t think restaurants have to be forced to deal with that. The only thing I could support is “if revenue >X then allergen disclosure is mandatory”. I know personally multiple little shops that had to refuse customers, because that’s extra hassle and responsibility that they can’t afford to deal with.
The places I worked over 15 years ago had extensive lists of allergens. They were mostly chain or corporate, I think the mom and pop places did a little guessing. I wouldn’t trust them.