I am a teacher in the American Department of Jiahua Shida. First of all, I'm not a trustee. I can answer this question.

The admission notices of American universities are generally issued in March and April each year. Once you are accepted, the school will send a notice in the form of a letter, and you should reply as soon as possible. If you temporarily change your mind and don't want to go, you should also inform the school in time and apologize.