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Ineligibilities and Refusals: 

 
Ineligibilities:

It is recommended that visa applicants be aware of the following ineligibilities that may preclude them from receiving a visa to travel to the U.S. before signing up for an interview with a Consular Officer:
http://travel.state.gov/visa/frvi/ineligibilities/ineligibilities_1364.html

Refusals:

The most common type of refusal for a Non-Immigrant Visa is 214(b), which means that the applicant was unable to convince the Consular Officer adjudicating the case that he/she intends to return to his/her home country after visiting the U.S. A 214(b) refusal does not preclude the individual from re-applying for a visa after four months time, or after their situation has changed considerably.

A 221(g) refusal signifies that the Consular Officer needs additional information before the case can be adjudicated further. If the burden of proof is on the applicant, the Consular Officer will indicate in the refusal letter, in writing, what he/she needs to supply the Consular Officer in order to continue adjudicating the case. Applicants needing to submit additional documentation can come to the U.S. Embassy of Lomé without a prior appointment on Tuesday afternoons, between 2:00 – 4:00pm only. If the U.S. Embassy needs to do additional investigating on the materials provided, the applicant will be notified directly once the case has concluded.

Non-immigrant visa issuances by visa class and by nationality are available here:
http://travel.state.gov/visa/frvi/statistics/statistics_1476.html