Invitation format?

Question

When writing an invitation letter to have a foregin friend come to vist, should it be written in paragraph format? Also, how do I prove my United States citizenship in the letter? Thanks!

Answer 1

Letters of invitation are not required for B1/B2 visas (they do not necessarily hurt, but neither do they necessarily help).  Therefore, there is no specified format.  If you do write a letter, it should introduce yourself, your relationship to the visa applicant, the purpose of the visit, and your willingness to cover costs associated with the visit.  Include your contact information.  You do not need to prove that you are a US citizen.