It seems like your sentence was cut off, but I'll provide an answer based on the context you've given. If you meant to complete the sentence about Americans and their habits, it might be related to the idea that many Americans are known for being active or mobile. Here's a possible completion:

"Few Americans remain in one position for long periods; they tend to stay active."

If this isn't what you were aiming for, please provide more context so I can give you a more accurate response.