The good ol’ U. S. of A. does not recognize ‘dual-citizenship’.
Granholm, you’re either an American or you aren’t, period.
I guess you better tell the US State Department. They think otherwise.
US State Department Services Dual Nationality
http://travel.state.gov/travel/cis_pa_tw/cis/cis_1753.html
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.