That's an interesting question, especially as it relates to the whole thing with most Americans not having passports. But, traveling across timezones is not ma

That's an interesting question, especially as it relates to the whole thing with most Americans not having passports. But, traveling across timezones is not mandatory, while DST is. Choosing to experience stress, additional radiation, and a government fondling is one thing, having it forced on you in your own home would be another. Also, when I travel to California, I'm happy to get up at 6 am local, and go to bed at 11 pm, which leaves my body clock mostly alone. (Europe is much harder.)