In recent years there has been a flurry of bi-lateral trade deals between countries and the emergence of regional trading blocs. For example, the European Union now has over 30 separate international trade agreements including those with countries such as Colombia and South Korea.
Since 2008 all US citizens MUST have a US passport to be allowed to enter the United States. If your aunt travelled to Jamaica with just her US naturalisation certificate, she would not be able to board her plane back to the US. She would have to come to the Embassy to apply for a passport in order to return home. Issuing a new passport takes at least a week, so this could extend her holiday much longer than she had planned. The good news is that she can apply for a US passport before she leaves the United States.
Visitors from other countries, including Canada, need a valid passport to land in Puerto Rico. For those from countries requiring a visa to enter the U.S., the same visa is necessary to enter Puerto Rico. Virtually every air traveler entering the U.S. is required to show a passport.All persons, including U.S. citizens, traveling by air between the United States and Canada, Mexico, and Central and South America are required to present a valid passport. This includes most of the Caribbean except Puerto Rico.or those from countries requiring a visa to enter the U.S., the same visa is necessary to enter Puerto Rico. Virtually every air traveler entering the U.S. is required to show a passport.