It depends. If you are a woman, no, you have to usually take the child back to America or wherever you came from. If you are a man, you have to stay with the woman to help support the baby.
depends on where she was a citizen.
No, sadly they will be sent back.
YES!
yes, the baby would be a citizen
if he entered illegally, unfortunatly the awnser is no
It depends how long you want to stay. if you want to stay and live there you need a passport and a visa, issued by the American embassy. if you only want to vacation there, you need a passport.
The Consulate of the country you are from, located in the UK, probably can answer this question for you.
Until her visa is up. Even if you marry her the process for her to legally stay in the country is very timely and costly. So if she stays she will essentially become an illegal alien until she is given residency.
YES
only if the baby was born in the us
Yes.
the baby is concederd an American citizen too because it is born in the u.s and it does not matter if the father is not a citizen the baby can still get benefits!