The root causes of farmers' unrest and protests in the late nineteenth century were O banking and railroads
O weather and mechanization.
O legislation limiting the size of family farms.
O the abolition of slavery and the labor system that was to take its place.​

A

Explanation:

They contended with economic hardships born out of rapidly declining farm prices, prohibitively high tariffs on items they needed to purchase, and foreign competition

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.