Yes, dual nationality doesn't stop you from getting a British Passport.
You can't even get schooling in the UK unless you get a full citizenship
US citizenship.
Yes, with a passport you can fly from the US to anywhere.
Passports aren't issued by cities, they are issued by countries. In order to have a passport, you need to be a citizen of the country you are applying to. So if you are a British citizen, you get a UK passport, if you are a Canadian citizen, you get a Canadian passport. It doesn't matter where you were born, it's what country you are a citizen. If you don't have citizenship then you cannot have a passport. Ex: A Canadian citizen, who is NOT an American citizen cannot have a US passport.
You' re asked for the passport you're 'traveling on' if you're in the US. You'd probably be asked to appear in person as this might be consider your first passport application (as an adult?). Having the number of the passport or a photocopy would be great help in proving your citizenship. Hopefully you have a UK birth certificate, but these are easily obtained via the Internet also. Once you have that UK passport, it's good for all of the EU as well.
He will become a dual citizen of the uK and the US.
He doesn't have US citizenship. Still carries his Haitian passport.
If you have dual citizenship, yes you can.
Yes absolutely! Your child will have dual citizenship: • American citizenship by birth in the United States ["lex soli" ] • British citizenship by descent being born to a British citizen ["lex sanguinis"]
You can get UK citizenship by decent. There are some caveats though depending on when you were born.
Use your UK passport for easier entry. Am surprised you have dual citizenship though the US didn't allow it.
Maybe there is dual citizenship, but you need to contact passport services to find out.