Yes they can!
Specially for if you say you are applying for a US postal delivery service.
yes
No. The person is still subject to the terms of the visa. If the person with the work visa marries a US citizen, it shortens the residency period needed to apply for naturalization, but still does not automaticaly change the visa.
You don't.
A person with an expired visa must apply for a new visa prior to applying for US citizenship. You can't apply when you have an expired visa.
Yes.
The origin of a person's name has no bearing on the difficulty of obtaining a U.S. visa.
To maintain a US work visa, a foreign person must fulfill certain requirements. This typically includes maintaining valid passport and visa documentation, abiding by the conditions and limitations outlined in the visa, and adhering to US immigration laws. Additionally, individuals must maintain employment with an authorized US employer and avoid engaging in unauthorized employment or activities that could jeopardize their visa status. Regularly updating and extending the visa as necessary is also essential.
Nobody can work in the visa on a visitor visa. Short duration courses like cookery class that will not add any credits to a course can be attended using a visitor visa. But working in the US, that will enable you to draw salary is not allowed on a visitor visa.
Any person not designated undesirable can enter the US with a properly applied for and validated Visa.
Yes, L1 visa is a work permit visa. The L1 visa enables employers to transfer employees to US office or establish a office in the US. This implies that a person on a L1 visa can work. It is only a change of workplace by remaining in the same organization.
One of the requirements for qualifying for a visa is that the person should have a strong financial background. He/she should be able to support himself/herself during their entire stay in the US and not become a public charge. The person should demonstrate this to get the visa approved. So it is not possible for a person in debt to get a US visa.
Yes, provided he or she does not overstay the expiration of the visa.