[whiletruefork]

I'd be interested to see the distribution of passports geographically across the US. Some parts of the United States just don't lend themselves to easy travelling. Other than Canada or Mexico it isn't as easy to travel abroad (or neccessary) as it is for Europeans. The US spans Mountains for skiing, beaches for surfing, jungles, deserts, you name it - we've got the geography for it. In fact, it would be interesting to compare these statistics to possibly europeans leaving the EU zone (since then we would have geographically equivalent sets).

In conclusion - get a passport, travelling is awesome!