The Answer is Serf because they are the lower most class which is also known as the peasants who are enslaved or put to work to to there economic class they where also not able to run away nor where they to move to another plantation
SERFS are the members of the feudal system was MOST tied to the land.
Serfs are the peasant farmers who work the lands own by their feudal lords. Each serf is assigned a plot of the lord's land which they are responsible for. They are not allowed to move or change occupation without the permission of their feudal lord. Thus, they are tied to the land they are working on.
Disease was the greatest threat on the trail, especially cholera, which struck wagon trains in years of heavy travel. Most deaths from disease occurred east of Fort Laramie. Accidents were the second most frequent cause of death on the trail.
