An alien MUST get a visa BEFORE coming into the U.S. You would get the visa at the U.S. embassy/consulate in your country.
The document that prospective immigrants filled out before coming to the United States is a Form D-260 which is an application for a Visa to the United States. It is formally called the Application for Visa and Alien Registration.
Yes, a US citizen can marry an illegal alien whose Visa has expired in San Francisco. The illegal will still have to renew their Visa to stay in the US.
A Big Hairy Vagina Visa!
if you are from other country, No!
An illegal alien.
yes he will
Any person who is not a US citizen and comes to live here, is an alien resident by law (including green card holders before they become citizens)
The US citizen needs to petition for future spouse for the K-1 visa. So once the visa is issued the alien can enter US. Within 90 days after entering US the wedding should take place. Conditional status is given to the alien which is valid for 2 years. After which the conditions can be removed and the alien is given the green card.
In the immigration context an alien refers to a foreign immigrant. The answer is, yes, but there is not much information to make further comment.
As long as you have a US visa with you, you can also enter Mexico.
Yes, but you need a visa. (US citizens also need a visa for Australia. In fact, everyone except citizens of Australia and New Zealand needs a visa for Australia.)
No, any alien needs to have a visa depending on the purpose of visit to US. There are A TO Z categories of visas available based on the applicant's need. For example you should apply for K-2 visa for touring US, F-1 for student visa,H1-B visa for work visa etc.