I don't know about buying life, but you don't have to be a citizen to buy property.
Yes. A person does not have to provide proof of citizenship to purchase real property in the US.
Yes
You have to have a valid VISA, and reside in this country for at least two years before that's possible. Call your trusted bank or lender for further instructions.
Generally speaking, anyone can buy property in the US
If it's a new car, you'll need a valid US address and/or driving license.
see you in jail!
No visa is required to buy property but to enter the US, you would need at least a b-2 visitors visa.
They can't buy arable lands.
No, you have to be a US Citizen.
Yes, a foreigner can stay in the US if they marry a US citizen by applying for a marriage-based green card, which grants them legal permanent residency in the country.
Yes
Florida