Seventeen subspecies of the American Kestrel are recognized, generally based upon plumage, size, and vocalizations.
This is the nominate subspecies Falco sparverius sparverius which is found in most of the United States, Canada, and Mexico.

1st & 2nd photo: Bosque Del Apache National Wildlife Reserve, San Antonio, New Mexico, USA, 13 January 2019
3rd & 4th photo: Rio Grande Nature Center State Park, Albuquerque, New Mexico, USA, 17 January 2019