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yes
Marry him or get him married to someone else for papers, they dont have to have a realationship. Need three witnesses
You can get a passport to anywhere no matter if you are married to someone of that nationality or not. If you want to go to Romania that go with or without a romanian husband or not. You can become a Romanian citizen if you marry a Romanian and therefore get a Romanian passport.
No, due to fraud.
You may marry i have done it with only my passport go to your country counsult to get an undated passport.
Someone with UK passport
Yes of course. But There is the question of where you will marry because if it is a Catholic wedding then there are preparations for church weddings.
i met a girl long time back and we decide to get marry originally she is Lebanese but she was born in Brazil and she is holding an Brazilian passport so how can get the Brazilian passport after marry my girlfriend?
If you have a parents that had british citizenship you are eligible for a british passport. Otherwise you have to either marry someone with british citizenship or stay in the country for a certain amount of years (can't remember how many) which is called "naturalization".
A valid US passport and a plane ticket
you become a citizen!
You need to add more details. What papers are you referring to?