Applicants applying for a non-immigrant visa to the United States must overcome the presumption that they are intending immigrants, as outlined under Section 214(b) of the Immigration and Nationality Act (INA). To this end, they have to demonstrate that they possess strong and sufficient ties to their residence outside the United States that compels their return. Applicants do so by providing evidence of their familial, economic, and social ties to their residence at the time of interview. The burden of proof rests with the applicant. Applicants who are unable to overcome this presumption are refused under Section 214(b) of the INA.
For more information and further reasons why your visa may be refused please visit: Visa Denials.