I seem to remember that the US does not allow dual citizenship. That is, to be an American citizen you must be a citizen of the US ONLY.
Was I wrong?
You can have dual citizenship until you’re 18 i believe it is. Then you gotta choose one or the other.
My nieces and nephews have dual citizenship with Ireland. One of the brothers also has dual citizenship with Brazil.
We changed some time back.
Yes.
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.
http://travel.state.gov/travel/cis_pa_tw/cis/cis_1753.html
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.
Yes and no... The US doesn't recognize any other citizenship for you, but does not prohibit you from gaining other citizenship, either. Getting a second citizenship does not nullify your US citizenship, and most other countries automatically consider your gaining of their citizenship to be an implicit renouncement of US citizenship.
But the US likes to hold on to its people, so you need to pay a bunch of money and spend a few years to actually renounce your citizenship formally.