Answer:
It was extramly dangerous to travel by wagon, there was the threat of bandits, native american tribes, and Buffalo, plus added diseases and weather conditions, when the train was invented and used for civilian use after the American civil war, railways were built from the east and mid-west to the west, they were deamed more safe and it was a faster way to travel
It would be the "Ku Klux Klan" that is considered to be a domestic terrorist group, since they have a long history of intimidating people (especially blacks and Jews) with whom they disagree and degrade.
The answer is number one, proof.