What does it mean to go to the United States to visit relatives and stamp the date on your passport?

Legal entry certificate, indicating the entry period. When visiting relatives in the United States, the passport is stamped to prove that the passport holder has entered the country legally; The date is written to indicate the entry period, and it was the last time you were allowed to stay in the United States.

After visiting relatives in the United States, you need to arrive at the passenger exit and wait in line for inspection. You need to submit your passport, DS-20 19 form and CF-6059 customs declaration form to the immigration officer for inspection.