The US has made great strides in the last decade or two. Great international foods such as Lindt and Toblerone chocolate, Nutella, etc. have become easy to find in any major grocery store. You can find cheese fondue and pickled herring, if you're lucky. Mexican food has been easy to find for an even longer time.
It's even possible to find high quality bread like they make in France and Germany. Hearty, filling, good-tasting even without adding anything to it. It's sometimes difficult to find, and it's certainly pricey, but it does exist (and it's so much better than American bread). I've even had the pleasure of tasting some high-quality pastries here (even harder to find than good bread, and even more expensive). In Germany and France, most people buy their bread and pastries at bakeries, and almost all of it is high quality. Even the grocery store bread is good. I wish more people in the US would refuse to eat low-quality bread and cheap glazed donuts, and demand the better stuff; demand would go up, supply would go up, and ultimately, because it would no longer be a specialty item, prices would come down.
What are some other foreign things the US should adopt?