A US citizen would have to apply for a visa and become resident. Alternatively they could marry a UK citizen. In addition a British Company could invite the US citizen to work in the UK and apply for a work visa on their behalf. There are quite a few ways to do it legally.
How do immigrants become a Canadian citizen
no
Yes, the foreign citizen and immigrants need to be subjected for a UK test for them to be British citizens.
yes a immigrant can become a citizen
No. Immigrants must fulfill certain requirements to become Mexican nationals.
You should look up "How to become a citizen in the UK". It should be the same.
You can easily become a UK citizen if your spouse or civil partner is a British citizen.
To become a UK citizen, one must meet the knowledge of English and life in the UK requirements. They also must be of sound mind, health, and be at least 18.
you either be born in the UK OR passport done in the UK it depends
No, it would be considered a marriage abroad.
Immigrants sign a deceleration of intention that is filled with the CIS.
The Naturalization Law of 1790