Yes USA can have bread just as good as in France but it's considered in the tails of the distribution while in France it's considered near the mode.
I think there's sometimes a tendency among Europeans in particular to write off all American food as being essentially the same as the most iconically awful brands we have over here: Wonder bread, Velveeta cheese, Hershey's milk chocolate, Bud Light beer. And that's just not true.
I'm sort of inspired by Vox's article on the "boring lunch" here to start packing simple sandwiches again, which I haven't done in years. If I do, I'm probably going to be able to get pretty good bread, butter, cheese, and meats -- they're just not that hard to get here.
Having the good stuff suffusing your daily life rather than being a specific thing you need to go get makes a difference in your relationship to the food. It’s just easier. It’s not a decision you make, it becomes a default thing you get.
The old school sliced white loaf in a bag that was very popular in the 1960s has been in decline for at least a few decades. I rarely see it anymore.
The bread in Copenhagen was fantastic, though.