Problems can be avoided by taking commonsense precautions before traveling. If people who believe they may be dual nationals and do not wish to be, they will need to find out from the government whose citizenship they do not desire exactly what they need to do to renounce that citizenship. If they have questions about whether a particular country is safe for travel, the State Department posts travel warnings and consular information sheets at http://www.travel.state.gov/travel_warnings.html. Clearly issues like this are unlikely to come up between countries that have good relations. But if there is any question, it is best to be armed with more information rather than not enough.