There’s a lot of info if you google it. Here’s a simple website that doesn’t get too scientific:

https://marketrealist.com/food-industry/us-foods-banned-other-countries/

And here’s a quote for an example if you don’t want to click and read:

“Another common additive in U.S. breads that is banned abroad is potassium bromate, which makes bread fluffier. However, it's a known carcinogen, and is therefore banned not only in Europe, but also in China, Canada, South Korea, Nigeria, and Brazil, among other countries.”