Like so many things Americana, it's about quantity over quality. Our bathrooms aren't as well engineered as European bathrooms, but they are plentiful and spacious. It's MUCH harder to find a public bathroom in Europe, and I am sure cost is an issue.

And I actually prefer the American bathrooms. I often refer to European toilet stalls as "fart coffins" given how claustrophobic and un-ventilated they are. If you can get over the idea that other people in the bathroom are pooping (gasp!), they are perfectly fine.