Which institution should I apply for a tourist visa in the United States?

You can apply for a tourist visa in the United States through a travel agency. The travel agency can help you review the information and make an appointment online at the American Embassy, including face-to-face training, what you need to pay attention to and so on. There is no intermediary for this statement, and there are visa agents online. Personally, I think the travel agency is more reliable. A larger local travel agency can completely help you, and the cost is about 1800. Can save a lot of trouble. My friend did it through a travel agency this year, and signed it five working days after the face-to-face signing, which is still relatively fast.