At the US Consulate applicants for a USA Visa will have an opportunity to explain the reasons for going to the United States and present supporting documents.
An invitation letter will help establish that the applicant has a credible reason for traveling.
It is important that applicant respond truthfully to the consular officer's questions. Applicants should not present falsified documents.
Making false statements or presenting fake documents to a consular officer is a serious offense and could result in becoming permanently ineligible to travel to the United States.
How to write an invitation letter:
The tone of an invitation should be always positive, in anticipation of a pleasurable occasion.
Extend the invitation, naming the event and including the date, time, and place. If the event has a special purpose, such as honoring someone or celebrating an anniversary, state this.
Be sure your invitation letter includes:
The name of the person sponsoring the event (who is the host/hostess?)
Exactly who is invited (can someone bring a guest, spouse, child?)
What type of social event is being held
The date, address, and time of the event
Directions or a simple map if the location may be difficult to find