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Unless you are working for a US company subject to the Foreign Corrupt Practices Act... essentially none.
According to the US Supreme Court:
Quote:
The jurisdiction of the nation within its own territory is necessarily exclusive and absolute. It is susceptible of no limitation not imposed by itself. Any restriction upon it, deriving validity from an external source, would imply a diminution of its sovereignty to the extent of the restriction, and an investment of that sovereignty to the same extent in that power which could impose such restriction.
However, dual nationals owe allegiance to both the United States and the foreign country. They are required to obey the laws of both countries. Either country has the right to enforce its laws, particularly if the person later travels there.
As the other posters have already noted you are subject to all laws and regulations of any country that you are in. As for American laws, clearly state laws do not apply outside of the boundaries of the the respective states, and generally speaking the same applies to federal laws but their are some areas of law that do apply.
Only a few specific laws (say treason), or ones that target the behavior of American citizens abroad - (bribing foreign governments, sex tourism, etc).
Otherwise, you must obey the laws of the jurisdiction in which you find yourself physically located.
It's illegal for US citizens to visit Cuba without permission. I believe it's a $65,000 fine.
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