Upvote:8
We get a steady trickle of questions from people whose US visa application was rejected after an apparently perfunctory in-person interview. It appears that they have a rule that they must conduct in-person interviews for all applicants even when they've already decided based on the written application to reject it. (But I don't think we have found such an explicit rule state in so many words in any official document).
In your question and the comment below it, it looks like you were hoping to support your application on documents which you did not mention in the application, expecting to disclose them only at the interview. That is a common theme in this kind of questions, and is by any means a recipe for failure.
Always include all information you want to rely on with the visa application itself. The countries that do visa interviews do it such that they can ask questions of you and gauge your reactions, not so you can blindside them with a sudden pile of papers and arguments you held back from the application.
After all, the purpose of needing to apply for a visa in advance is such that the bureaucracy can examine your supporting material in their own time and with less time pressure than if you show up at the immigration desk at the airport and expect a border guard to judge all your documents then and there. It would scarcely be an improvement to move that scene to a consulate instead.
Do not expect visa interviews to be a negotiation. They're not.