Revert back to Standard Time. Fall back an hour.

2 AM becomes 1 AM.

The U.S. begins Daylight Saving Time at 2:00 a.m. local time on the second Sunday in March and reverts to Standard Time at 2:00 a.m. local time on the first Sunday in November.
DST is not observed in Hawaii or Arizona, with the exception of the Navajo Nation, which does observe DST, even in Arizona.