Very uncharitable way to phrase that, American second language prevalance is similar to other English dominant countries like the UK or the Australia.
Americans in general don't speak as many languages as Europeans because they already speak arguably the most useful language. I've lived in 20 countries, and in every single one for them I've been able to find someone who speaks English. People are so ingrained with the need to know the language that I've actually met people who are embarrassed about their English talking to me in their own native country.
If you grew up speaking Greek, Romanian, or even something like Italian, this absolutely would not be true. Maybe you could find a person or two to talk to, but definitely not dozens casually in everyday situations. So you have to learn multiple languages by necessity. And since European countries are so small, close together and all have their own languages, you also end up picking up your neighbors languages.
