Why do students need the ID cards of their former classmates in the United States to apply for a green card?

Good evening. Everyone answered very well. Let's add one more thing:

1. According to the Law of People's Republic of China (PRC) on Identity Cards:

Sixteenth one of the following acts, given a warning by the public security organs, fined two hundred yuan. Illegal income, confiscate the illegal income:

(2) Renting, lending or transferring a resident identity card;

Therefore, personal ID cards cannot be lent out.

I have a friend who works in a multinational company in San Francisco, USA. Has become an American citizen. When she became an American citizen a few years ago, the US Immigration Service did not ask for someone else's ID card or anything.

As you said, if you lend out your ID card, your classmates will be implicated in any illegal activities in the United States. I suggest you don't be embarrassed and refuse decisively.

Knowing a little is not necessarily perfect. Let me give you some reference. I hope the above answers can help you.