Although Ireland allows dual citizenship, there are a number of countries which don’t allow dual nationality, regardless of the circumstances. Answer: By law, U.S. citizens, including dual nationals, must use a U.S. passport to enter and leave the United States. Free movement to Turkey, Hong Kong, Japan, and Singapore, among others. Barbados is one of the few countries that encourages those living overseas to get a second nationality. Countries That Allow Dual Citizenship - WorldAtlas The Brazil Business. Under Singaporean law, an individual who automatically acquires Singaporean citizenship at birth retains that status even after acquiring U.S. citizenship. Azerbaijan: No: Bahamas: No: Dual citizenship allowed until 18 years of age. Dual Nationality Persons may have dual nationality by automatic operation of different laws rather than by choice. General information … Singapore does not recognize dual nationality beyond the age of 21. How to Get Bahamian Citizenship Once that's taken care of, the dual citizenship application process works just as it does for anyone else eligible under RA 9225. Dual Step 1 : Thai citizens can arrive at Barbados without a visa. Citizenship - Use Block Letters for all names except your signature. Caribbean Citizenship