Barry was born to a foreign national father. Barry inherited his father's "citizenship." Even assuming Barry was born in HI, he would have been born a dual national. A born citizen of TWO country's. A citizen of the US and a subject of the UK. Therefore, how in the world can a Natural Born Citizen of the United States be "Governed" (as admitted by the vaunted FTS web site) in any way shape or form by a foreign country?
Oh and your scenario of "country x" delaring soverign citizens of another country "their" citizens...is meaningless. It would not be recognized by the international "community", nor an international court and so on. Besides. The country affected by such an action could then, in your scenario, turn around and declare all citizens of country x to be their citizens now. That's all meaningless.
Here’s the US State Department’s position on Dual Nationality:
“Dual Nationality
The concept of dual nationality means that a person is a citizen of two countries at the same time. Each country has its own citizenship laws based on its own policy. Persons may have dual nationality by automatic operation of different laws rather than by choice. For example, a child born in a foreign country to U.S. citizen parents may be both a U.S. citizen and a citizen of the country of birth.
A U.S. citizen may acquire foreign citizenship by marriage, or a person naturalized as a U.S. citizen may not lose the citizenship of the country of birth. U.S. law does not mention dual nationality or require a person to choose one citizenship or another. Also, a person who is automatically granted another citizenship does not risk losing U.S. citizenship. However, a person who acquires a foreign citizenship by applying for it may lose U.S. citizenship. In order to lose U.S. citizenship, the law requires that the person must apply for the foreign citizenship voluntarily, by free choice, and with the intention to give up U.S. citizenship.
Intent can be shown by the person’s statements or conduct. The U.S. Government recognizes that dual nationality exists but does not encourage it as a matter of policy because of the problems it may cause. Claims of other countries on dual national U.S. citizens may conflict with U.S. law, and dual nationality may limit U.S. Government efforts to assist citizens abroad. The country where a dual national is located generally has a stronger claim to that person’s allegiance.
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.
Information on losing foreign citizenship can be obtained from the foreign country’s embassy and consulates in the United States. Americans can renounce U.S. citizenship in the proper form at U.S. embassies and consulates abroad.”
http://travel.state.gov/travel/cis_pa_tw/cis/cis_1753.html
My mother was born with dual citizenship because my grandmother was not a US citizen at the time of my mother's birth; however my mother didn't even know about her dual citizenship until she was in her 70s. How was my mother "governed" in any way shape or form by a foreign country?