How exactly December 25th came to mean the Christmas we all know today is unclear. No specific dates exist in any of the literature, and it is thought the date may correspond to the nine month period after the Annunciation, when Jesus was conceived, as well as to the Roman pagan midwinter festival.
In any case, documented commemorations
The early Pilgrim settlers of America considered any form of celebration sacrilegious; more so even than their Puritan brethren in England, who considered the holiday little more than a festival of decadence. That feeling was intensified by the anti-British fervor that swept over the colonies during the Revolutionary War and the early years of the colonies.