Is invitation letter required for US tourist visa?
A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. If you choose to bring a letter of invitation or Affidavit of Support to your interview, please remember it is not one of the factors used in determining whether to issue or deny the visa.
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There is no minimum balance requirement for your bank account, however, based on the experience of others we recommend anywhere between $5,000 to $10,000 will be sufficient.
An application may be denied because the consular officer does not have all of the information required to determine if the applicant is eligible to receive a visa, because the applicant does not qualify for the visa category for which he or she applied, or because the information reviewed indicates the applicant falls ...