How can American immigrants go back without a green card?

If you are not an asylum green card, you can apply for leave or a visa to return to the United States. You can't take a green card to take refuge in China, not to mention that you haven't got a green card yet.

However, if you leave the country for more than half a year, your naturalization will be affected later.

If you leave the country for more than a year, the US Immigration Service will doubt your willingness to live in the United States.

If you must leave for more than a year, it is recommended to file your tax returns normally and keep traces of your life in the United States, that is, house rental, credit card bills and the like; When you get your green card, you will have a chance to explain to the US Immigration Service why you use people's ideas.

Good luck!