If you are a US citizen, there are no transit restrictions if you're arriving from the mainland. If you are a non-us citizen and arriving from anywhere other than the mainland US, the same restrictions (if any) apply as if you were landing at any other US port of entry.
it is no different from flying to another state, (as Hawaii is a state). Hawaii has stricter agricultural rules though.
born in USA...
Sure, there are no restrictions on marriage. However, being married does not automatically change one's visa status or citizenship. Make sure you understand the requirements to become a legal resident so that you are not separated from your spouse by INS!
Yes, as long as the British citizen has not committed a crime or is otherwise ineligible for entry into the US.
The US President must be a US citizen, naturally born on US soil. Congress does not have this requirement.
None, unless the country where the US citizen has requirements for long stays that have not been met by that citizen.
what are the requirements for becoming president of the us. 35 years old citizen - born in the us resident for 14 years
No. In fact, there is no mechanism whereby the US government can force any legal citizen to leave the US or deny re-entry to the US to any legal citizen.
No. Immigrants must fulfill certain requirements to become Mexican nationals.
Someone with a green card is a legal resident, it will be about the same requirements as for US citizen to get a marriage license, check with your county clerk if you have any doubt over this matter.
Canada does not allow a US Citizen to enter with a DUI unless they have a Transit Visa. Countries that do NOT disallow entry due to a DUI: Mexico Columbia ? Panama ? Costa Rica ?