No. He or she must still apply for permanent resident status and then citizenship as required by US Immigration laws.
of course it can
Nope.
go see a Lawyer
About 2 yrs
no
No. The only way to become a citizen is to be born in the country or do the regular process of becoming a citizen.
Just because you marry a legal citizen, it does not make you a leagal citizen. When I married my husband who was a legal alien he still had to go through the same channels to become a legal US citizen and he had to be sworn in.
No. He or she is required to apply for permanent residence status according to US immigration laws.
No.
Yes.
naturalization
As long as they have the appropriate visa, they can come and go as they please.