You could apply through the local post office
You can actually download them online from legitimate passport office sites or private passport processors.
US citizenship.
Passport is a requisit.
You Don't. You need to have a passport in order to have a passport number.
The naturalization number is not located on the US passport. The naturalization number can be found on the Naturalization certificate.
You'll need a US PASSPORT to return to the US.
in order to leave or return the US you must have a passport.
No. The US is not a member of the EEU/EEA.
Maybe there is dual citizenship, but you need to contact passport services to find out.
no because you need a Italy passport. You cant use a us passport
Practically, it is safe to travel with a legitimate, valid passport of your country. If you are a dual passport holder then you use the particular passport for that country and the other passport for the other country. like if you are travelling to US then use US passport if you are travelling Canada use your Canadian passport.
You need the passport of the country of which you are a citizen. You cannot have a US passport until you are a US citizen.
Yes. This is very much recommended so that there is lesser hassle and questions on the part of the immigration. Use your US passport when entering US and your Trinidad passport when entering Trinidad. This is legal and lawful.