If you go to Mexico within the validity period of the American tourist visa after entering the country, please ask questions when you enter the country again!

1, B 1/B2. Generally, multiple round trips are made once a year, but you must return to China within half a year and then go to the United States. It is equivalent to re-entering the United States from Mexico. The Immigration Bureau will reschedule your stay. For example, if a foreigner comes to China and gives him three months, if he doesn't have a contract accepted by China, if he still wants to stay in China. It should still be the same for China people to go abroad.