How long is the validity of the visa for visiting relatives in the United States? What will happen if you don't come back after you go?

The visa for visiting relatives in the United States (B2) can be valid for up to 6 months, and immigration officials should fill it in the application form for non-immigrant entry (I-94) when entering the country. To leave America, you must hand in this form. If you don't leave the country before the specified date, it will be regarded as illegal residence. According to the immigration law, anyone who has stayed in the United States illegally for less than six months may not re-enter the country within three years from the date of departure; Those who have stayed illegally for more than three months shall not re-enter the country within ten years from the date of departure. The law belongs to the law, but implementation is another matter. It's just that people are in the United States, and the possibility of being caught is very small. Don't go to Arizona as long as you are not ready to drive. Nobody checks their ID cards at ordinary times, because there is no national ID card in the United States. Good luck.