But living in China also shows you what a nondemocratic country can do to its citizens. I've seen protesters tackled and beaten by plainclothes police in Tiananmen Square, and I've been videotaped by government agents while I was talking to a source. I've been arrested and forced to flush my notes down a toilet to keep the police from getting them, and I've been punched in the face in a Beijing Starbucks by a government goon who was trying to keep me from investigating a Chinese company's sale of nuclear fuel to other countries.

When you live abroad long enough, you come to understand that governments that behave this way are not the exception, but the rule. They feel alien to us, but from the viewpoint of the world's population, we are the aliens, not them. That makes you think about protecting your country no matter who you are or what you're doing. What impresses you most, when you don't have them day to day, are the institutions that distinguish the U.S.: the separation of powers, a free press, the right to vote, and a culture that values civic duty and service, to name but a few.