Where did Mormon trail group originate?

Technically, they originated from all over the world. The first group that arrived in Salt Lake City left from Nauvoo, Illinois. Later groups came from various parts of the U.S., Canada, and Europe. Most groups met in St. Louis to organize and gather supplies before heading out on the trail, just as groups traveling other pioneer trails. As the Mormon trail was used mostly from 1847 until the transcontinental railroad in 1869, there is no one "mormon trail group".
Technically, they originated from all over the world. The first group that arrived in Salt Lake City left from Nauvoo, Illinois. Later groups came from various parts of the U.S., Canada, and Europe. Most groups met in St. Louis to organize and gather supplies before heading out on the trail, just as groups traveling other pioneer trails. As the Mormon trail was used mostly from 1847 until the transcontinental railroad in 1869, there is no one "mormon trail group".