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A 214 B denial implies that the consular officer who was examining your visa application was not convinced that you were intending to return to your home country before the expiry of the visa. As explained here on the website of the US Embassy in Mexico, the consular officer has to be convinced that:
- Has a home outside the United States that they will not abandon;
- Is visiting the United States temporarily and will leave when the stated purpose of travel is complete;
- Is able to pay for the trip; and
- Meets the requirements of the visa type for which they are applying, and/or that planned activities in the U.S. are allowed by that category.
The exact reason for your visa refusal is hard to tell, but will definitely be related the consular officer not being convinced about either or all of the above points mentioned.