[Gatún(CraigIsaMangoTreeLawyer)]

“But Obama, by traveling on an Indonesian passport at the age of 20, would have had to renounce his US citizenship”

A little lesson in foreign studies (politics)…A country does not know if one has more than one passport…period.

The only way that country would know if the person blabbed it to them.

[kabar]

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. Most U.S. citizens, including dual nationals, must use a U.S. passport to enter and leave the United States. Dual nationals may also be required by the foreign country to use its passport to enter and leave that country. Use of the foreign passport does not endanger U.S. citizenship. Most countries permit a person to renounce or otherwise lose citizenship.