What do you mean by the American immigration schedule? what do you think?

Advance and retreat refers to whether the timetable of a country or region has changed or updated in the immigration timetable. Advance means that the waiting time for immigration applications is decreasing, while retreat means that the waiting time is increasing. In the schedule of American immigrants, we can determine their advance and retreat by comparing the schedule of specific countries or regions between the two dates. If the timetable between the two dates becomes shorter, it means progress; If it gets longer, it means retreating. At the same time, we can also pay attention to whether the priority date of the country or region is advanced or postponed, so as to further determine the advance and retreat of the shift.