No, marrying a U.S. citizen does not automatically confer citizenship nor permanent resident status for the alien spouse, the required USCIS procedures must be followed. The interested party might wish to consult the United States Citizenship and Immigration Services website for more information, http://www.uscis.gov
No.
There is no such thing as an EU citizen. Each country of the union has it's own laws and governance over citizenship.
Someone Can Become A Citizen By (1) Birth Or (2) Naturalization.
You have to become a citizen first
Nationality can be acquired through birth in a country, descent from a citizen, marriage to a citizen, or through a legal process like naturalization. Each country has its own laws and criteria for determining who is eligible to become a national.
Yes. Marriage does not depend on citizenship to be maintained.
it is illegal
of course it can
Marriage for the purpose of obtaining entry into the US is fraud and against the law.
It is not possible to become a Canadian Citizen just by marrying a Canadian citizen. Citizenship cannot be acquired by marriage in any country.
A naturalized citizen - has gone through 'due process'. They Entered the country legally with a passport and ticket, and sought asylum through the proper procedures. A non-citizen has likely entered the country illegally, avoiding immigration checks etc, and has no right to be in the country at all.
No, it would be considered a marriage abroad.