How to get an American visa? My wife is studying in Canada, and I have an American green card. How can I help her to travel to America or visit relatives?

These two people upstairs may have never applied for an American visa or immigrated, and they don't understand the qualitative difference between immigrant and non-immigrant visas.

You are in a difficult position. You are an American green card, and your wife must apply for relative immigration. Since you gave it to her, it would be difficult for her to get a non-immigrant visa for visiting relatives, because you have told the Immigration Bureau that she has immigration behavior. You should know that more than 80% of this visa was rejected because of immigration tendency, so she should also be rejected.

She can try to apply by attending your graduation ceremony, but it is difficult, not impossible. All she has to do is prepare enough materials for Canadian schools to convince visa officers that she went back to finish her studies. Good luck!