good to know;

for US

In Your Native Country
When returning to or leaving from your native country, always present yourself as a citizen of their country (show them your native country passport, not your US passport, and declare yourself to be a citizen of your native country). When inside that country, be a citizen of that country. When dealing with the local police or any other local or federal official, if a question comes up about your citizenship, tell them you are citizen of that country. If they ask where you live, tell them in America. Don’t mention your dual citizenship or that you are an American unless specifically asked. In the eyes of that government you are citizen of that country first and subject to its laws and regulations even though you live in America.

If you go to a US embassy or consulate in your native country for help or assistance, represent yourself as an American. The embassy staff will probably ask about your dual citizenship. Why? Because as far as international law goes, your native country has legal claim on you first when you’re in that country. This may limit the kind of help the US embassy or consulate can give you, especially if you are in trouble with your native country’s laws and government.