Yes they can and they have been
yes
Robert clark
Contrary to popular belief, marrying someone does not make them a US citizen. You need to talk with an attorney, and not WikiAnswers.
yes
money!
no
You will need a passport.
Yes, many do.
yes through paper work and then you are welcome to come to the us as a us citizen.
Yes. You are an American CITIZEN (refers to the legal aspect), but you are part Jamaican by NATIONALITY (refers to blood). For instance if both of your parents are Mexicans, you are a Mexican by nationality no matter where you live or were you were born in.
http://jhcuk.org/citizenship.asp From Lawz
An Irish person can freely travel to and from England without any extra paperwork. However, Irish citizens who are not also British citizens cannot live in England unconditionally, and as such may be subject to deportation. An Irish citizen wishing to move to England is advised to obtain the appropriate legal paperwork to be able to either live permanently as an Irish citizen or become a British citizen.