"In its day, the Trail served primarily as a commercial highway. The military used the trail to haul freight to supply the southwestern forts. The Trail was also used by stagecoach lines, those seeking gold in California and Colorado, fur trappers, and emigrants. The Trail in effect brought together Spanish and American cultures and. Many interactions, both amicable and contentious, between settlers and soldiers and the Plains Indians also occurred along the Trail."
it was the main cause because the lower class were being forced into the military, which drove those who weren't in the army, to have a problem with it